More that the restrictions and drawbacks have been removed from other (mostly caster) classes. Put them back, says I.
You can say it but A) The Vast Majority of people don't want it and B) WoTC isn't going to do it.
Very, very few people actually have problems with the buffs and power given to casters EXCEPT in the realm that Fighter's haven't been given similar treatment. And again, I have to ask, why is it so hard to buff fighters? Why, if given the choice between "nerf everything in the entire game" or "buff fighters" is the more acceptable solution to nerf everything?
Yeah, giving something like that to any ranged weapon is asking for headaches.
Check the list, already there.
Unless - and this is a key point for many of these abilities - they are made available to pure single-class Fighters* only. The moment you multiclass it's whoop there go those abilities, never to be seen again. Gamist as hell, I admit, but having certain things (for all classes) be available only to single-class characters really serves to chop down on multi-classing shenanigans.
* - and some Fighter-adjacents, as long as the character only has one class.
But that isn't how the game works, you never have a multi-class that says "well, you don't REALLY get to multiclass."
And frankly, instead of creating a precedent that only some classes can actually be multi-classed.... they can just keep doing what they have done for the entire life of 5e and just not let these things stack. It is a perfectly fine solution.
Knocking an enemy prone instead of doing damage can be huge. It pretty much has to spend the next round getting up (if it can), meanwhile you can either keep it prone or whale on it.
If these work as ability-plus-damage then those upthread concerned about the return of spiked-chain foolishness have a valid point.
Wrong, that is your houserule. They have to spend half their movement to get up, and don't trigger any opportunity attacks in the process. So, you knock them prone, they get up and whale on you, you knock them prone again... who wins that fight? The person who can actually deal damage.
Again, you have to know what the actual rules are if you are going to accurately discuss them.
A full-martial party would, I think, be a rather uncommon sight. And, not many of these abilities would stack; slowing being the most obvious one, and if there's a weakening (that is to say, temporary Strength-reducing) ability that would be another.
And a full martial party SHOULDN'T be more rare than an all-caster party. That is another sign that there are serious imbalances in the game. A party of all casters is perfectly viable as is, with no multi-class. An all martial party feels weird and under-powered.