What I object to is the notion that casters NEED to have an uber CON, wear armor, take feats or dip into fighter class to have half a chance in hell of casting a massive portion of the wizard spell list including many iconic spells (don't cast fly on yourself without a good CON...you'll likely fall...even from getting hit with just 1 hp of damage).
Firstly, you are continuing to mischaracterize what I said even after I've clarified. I'm not saying every wizard needs a high con (and all that other stuff is nowhere near anything I said, so I'll assume you aren't aiming it at me) - just those that are expecting to use concentration spells and put themselves in harm's way and not have those concentration spells fail.
When I picture an illusionist, I picture someone that is of quick wit and quicker hands, someone who can be entertaining, deceptive and sneaky. But to listen you you guys, the illusionist in my head, the one that has been just fine (even iconic) for every edition of D&D is now badwrongfun and can now forget about casting Major Illusion, Phantasmal Killer and many other spells that have been the bread and butter of the illusion school for the last 40 years.
And this is exactly why you mischaracterizing my statements is bad for you. Because of it, you are ranting nonsensically.
The illusionist, and even the specific spells, you mention are a perfect example of a character that relies on concentration spells
and is actually doing something to avoid losing concentration. Sure, it doesn't involve a high constitution score - but that is fine because the character is being deceptive and sneaky, which reduces the number of attacks possibly coming their way, which means less (or even zero) concentration checks, so the chance of failing them is not as big of an issue.
You act like I am saying this character shouldn't work in 5th edition, when in reality it is an example of what I am talking about: you want to use concentration spells, you make it so you are good at doing so - rather than having this illusionist be low-con, low-dex, not even remotely sneaky or deceptive, and not using their various options to avoid rolling a concentration check, and then acting like something unreasonable has happened when they not only get attacked, they get hit, they take damage, and then they lose the coin toss that even being bad at concentration usually equates to.
But I think when someone is saying that CON should be possibly more important to a caster than INT then maybe...just perhaps there might be a hair of chance that it's gone a little too far.
Again, you mischaracterize my statment that Con should be at least, or even more, important than Int
for a character that specifically relies on passing concentration checks.
For my part, I think the designers could have accomplished this by simply not having a minimum DC to concentration saves
I think not having a minimum DC would actually irritate more people - and might even result in greater frustration among players that are playing characters that rely on concentration spells as their go-to "thing" and have not considered being good at concentration checks a priority as they fail a DC 2 check by rolling a 1 (it might just be my experience that missing a "sure thing" is more of a let down for the person doing it than losing a coin toss is).
or allowing casters to include their prof bonus
You mean give all casters one of the few things which makes certain casters special?
or limiting the number of saves they have to make per turn (maybe subsequent saves have to have a higher DC before they force him to make another save).
Best way to limit how many concentration checks you have to make is to limit how many times your character is taking damage... at least, that's my experience.
There are all sorts of ways the mechanic could be better, a bit easier on casters with a 10 or 12 Con and still make it really beneficial to have a really high con. To me (again...your mileage may vary), having a high con should be a benefit...not a necessity.
Having a high con
isn't a necessity. You can play any one of the spellcasting classes in the game and either A) choose not to care that you are losing concentration spells if you get hit, while avoiding getting hit, B) as A but also not avoiding getting hit, but choosing to still not care that you are losing concentration spells because of it, or, and this is the big one, C) don't use concentration spells.
As concentration saves are implemented (and as evidenced by some of your posts), I think it's very close to being a necessity unless you're willing to dip into a feat or a class. I'm sorry that I disagree, but I do. I don't think I'm "constraining" anyone by having that opinion. But I think concentration as implemented is certainly constraining and I think all of your posts are pretty much proof of that.
The only "evidence" to be found suggests that you would rather mischaracterize the statements of any disagreeing with you than actually have the same conversation that they are having.
And if my posts are "proof" of anything, it would be that there are a lot of different ways to play a wizard - and
some of them, need to consider Constitution very important.