Well, to tell the truth, neither is stealth in most versions I've seen. I'm not going to speak specifically about 5e because I don't know it well enough to, but it'd have been a nearly hopeless process in the three versions I know at all well (OD&D, 3e and 4e) because of a combination of inadequate skill, penalties for armor, and just needing to roll individually. That goes well beyond the DC.
Stealth has been important at every level least occasionally in every version of the game that I've played. The rules for a hide check (and invisibility) in 5e 2014 are pretty much the same as in the 2024 version.
This is not an issue with the fact that the fighter in heavy armor isn't going to be great at stealth, it's about the characters that are decent at it or even specialized. It should be easier to sneak past some enemies than others. They changed the rule from being an opposed check to a static DC which I think is a mistake and something I don't want in games I run and, so far, something ignored by the handful of DM's that I've played with (although they may not have been aware of the change).
I'm looking at practical concerns, not philisophical ones here (to be clear, there's nothing wrong with looking at the philisophical problem, but that's even less likely to get a player as compared to a GM anywhere).
I asked for an example of what you would do in the case where I, and the rest of the table if it matters, doesn't like the new stealth rules. You gave an answer that in no way resolves the issue at hand. I can't think of anything more practical than saying your suggestion doesn't address the issue.
And you're a GM so you have that luxury.
If you're a player and there's something you don't like you should bring it up with your GM, preferably outside of time during the session of course. But it's also dodging the question for which you simply don't seem to have an answer. Which is fine but that makes it a strange hill to die on.
Every version of D&D I've ever played* has had house rules or rulings about how to run things that aren't covered. It's part of the DNA of D&D. So I was trying to understand why you seem to take such a hard stand against them.
And when I have evidence the majority of GMs are good at that, I'll consider it more of an answer.
If the DM is consistently implementing house rules the players don't like they likely won't have a group for long. I think the majority of GMs want the rest of the group to have fun and enjoy the game they're playing together. Do you really assume the majority of GM's are power hungry bastards?
The DMG talks about house rules - that you ask the players about it and if it doesn't work change it. I've always assumed that's what most GMs do.
*With the exception, for the most part, of public games. With 4e, there were also limited house rules because of the nature of the way the game worked.
Edit - I was only asking about invisibility because you stated "A workaround uses other extent rules to bypass (to some degree) the problematic ones. It doesn't actually change any rules." I don't need to make a big deal out of this, I just disagree. House rules (and rulings) are part of how almost all D&D games I've played work.