I think your point about 4E hit the mark, but I also think it is telling in a way you might not have considered.
This entire idea rests on the premise that players would prefer a game where "I win" was not available. I think that basic premise is false.
As you noted 4E was extremely balanced and it was also for most players, not fun to play. Whether you think 5E needs more balance or not, it certainly is fun to play.
I don't think the "nova problem" is an actual problem at most tables, by saying that I don't mean that most tables don't experience this, rather I think most tables don't have an issue with it and I actually think on the other side of the coin there are tables that actually like this being there.
For those tables that do find it to be a problem, it is fixable with adventure design (which necessarily eliminates certain kinds of stories/play).
So the set of players you are left who need this are players who both find the ability to nova to be a problem and still insist on playing games with stories that are one/few fights a day with easy rests available. I think that is a very small set of players.
This entire idea rests on the premise that players would prefer a game where "I win" was not available. I think that basic premise is false.
As you noted 4E was extremely balanced and it was also for most players, not fun to play. Whether you think 5E needs more balance or not, it certainly is fun to play.
I don't think the "nova problem" is an actual problem at most tables, by saying that I don't mean that most tables don't experience this, rather I think most tables don't have an issue with it and I actually think on the other side of the coin there are tables that actually like this being there.
For those tables that do find it to be a problem, it is fixable with adventure design (which necessarily eliminates certain kinds of stories/play).
So the set of players you are left who need this are players who both find the ability to nova to be a problem and still insist on playing games with stories that are one/few fights a day with easy rests available. I think that is a very small set of players.