Have you consider your DM using your tactics against a Pc wizards?
Of course. And as a DM, I also do that. But he someway thinks is best to overrun us with many foes and do about 30/40 damage per round. As the frontliner of my group, it is usually me who protect my casters to be stomped. The monk also does some frontline job.
Nope there is not. Matter of fact there are plenty of rules about how they can.
There also are not rules saying you cannot do any of the following:
Shoot a pea with a straw down the throat of the fight causing him to choke out.
Protect onself from sneak attack damage using trolls blood poltices.
Cause a fight to have to win a charisma vs wisdom face off as an action in combat or be convinced to drop all his weapons and take off armor.
No rules forbidding any of those things.
All the attempted serious "counterpoints" like stab with dagger or rely on non-verbal spells just point to the agenda...
If you feel this will work for your games and make them more fun... Great... You dont need us internet yahoos to agree or sanction you.
But in my small amount of experience, a rule like this seems counter to the general rule structure of 5e and not needed and even harmful to set as a precedent in many games i have seen or experienced.
I'm not using you to validate me. I'm consulting which way you have, specifically, to fight a caster, both as a player and as a DM. A thing that you never answered. In my not as small amount of experience as a DM and player of D&D, even
by te book, you can improvise actions, and attempt things with various degrees of success. If not, you are playing the "hard rules" mode, in which anything not codified by a rule is forbidden. 5e operates just in the opposite way. You
can try to do anything that comes into your mind. That doesn't mean that it is going to work. The more fantastic an approach, the less likely to succeed. It is called Difficulty Class. Preventing to use verbal, somatic or material components
for a round or two isn't something crazy or unlikely to succeed, as shooting peas to the throat: A thing which
I would allow, at an extraordinary DC (30 or similar), and with an extraordinarily easy capability to avoid (Constitution save 10 or less).
The funny part? Troll blood poultices were components I've required for a regeneration potion a druid wanted to make, to restore the arm of one allied NPC when I DMed AD&D. It was a bloody good adventure to chase down that trolls during a siege. Only going out of the walls was a challenge by itself. And the weapons and armor part? It actually happened to the same group of AD&D, they gambled with some orcs, while the rogue stealed their weapons and armor. It doesn't happened in a round, of course. There are rules to don and doff armor, and takes at least one minute.
"And if some monster wants to grab my caster friend throat, I will kick it in the mouth first." Sorry, was there an OA provoked by this choke? Otherwise, you are waiting your turn **or** otherwise ready action but that goes **after trigger** not before, right?
Right. But this is a metaphore of "I will protect my friend". This is me saying, if someone tries to attack the casters, it will have to pass before me. But you aren't actually reading what I'm saying, right? There are many,
many consequences for an action like this. If you are using your main hand, you can't attack with your main weapon. You can't attack with a two handed weapon also. You can't move more than half your speed (it is a grapple, after all). If the choke succeeds, it isn't an autokill: it is disabling casting for as long you maintain your grapple. And you have disadvantage on the check. You don't
shut down rules, you
play by the rules: many spells have verbal components, you are disabling them, for as long as you maintain the grapple. You can still be attacked my the wizard friends. You can still be attacked
by the wizard. And if it is a cleric or a paladin you are choking, it isn't going to be a measly dagger: it is going to be a mace, warhammer, or sword. You aren't granting the caster disadvantage on their attacks,
unless you succeed in another opposed check. There are many, many assumptions you are making that just aren't true, just because the spellcasters need verbal components and somewhat bothers you that someone takes advantage of it.
Furthermore, I'm sharing something I do that could be useful. You may not like what I share, for a variety of reasons. It's fine! No one compels you to prove me wrong.
Just don't pretend to claim that it is somewhat unbalanced. It isn't. I've made my point, for why I don't believe it isn't: it is an action you hope to succeed, and it has its cost (at best, you will
never be able to do it with advantage, unlike many other things), and DC: the opposed check. It doesn't counter the rules, also. Not a single one. Nor it is unscapable, or unavoidable (why a wizard would be in melee with fighter if something hasn't gone horribly wrong?). But it is useful. If it weren't, why even bother? And
yes, it goes in both ways: monsters could attempt it also.
Based on what you are arguing, I think you dislike it on principle. You dislike that a caster could be somewhat shut down by a martial, in any way, even in a way that actually don't impede them to take actions, but only their best options, when the other way around is always there: a spell can shut down EVERY action a martial could possibly attempt (charm, dominate, entangle, fear, forcecage, hold person, hold monster, polimorph. suggestion, etc), with the same (or less) possibility to escape.