Opinion: will you be reluctant or eager to switch from 5E to 6E?

[KorvinStarmast]

I... and too hard to break (for more optimized PCs).

When I played an unoptimized (no res wis Con{1}, no war caster) spell caster the break in concentration was far too common in my experience.
Cast spell, get hit, miss the save, nobody has to save versus Spirit Guardians (for example, since the save is on their turn). (As but one example)

There's a good reason to optimize if you want the spell to work.

Spoiler: about a couple of egregious cases where a 60+ HP hit didn't break Conc

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( Dil's "cut damage in half tattoo once per long rest" was just icing on the cake in the late game where I was able to make a save that, with the amount of damage inflicted, normally she could not have).

Plenty of folks don't try to optimize for concentration maintenance.

{1} Correction thanks to Psyren