Klingon continuity is the only thing on here that can get me riled.
Faith of the Heart is... whatever. What Janeway did to Tuvix, I definitely wish didn't happen that way, but I can get over it.
But dammit stop fucking up Klingons, please. TOS gets a pass (and Enterprise, whatever its other problems, retconned a continuity fix for that.) But every Klingon fuckup after that is inexcusable. (Some more inexcusable than others.)
(Sorry. Sorry. I'll go take ten deep slow breaths now.)
Yeah the Klingons changed over time, but once you they have a Klingon in the regular cast it's kinda set at that point.
Worf is THE Klingon now. All other Klingons will be compared to Worf from here on out. Sure there can still be some variance, but if they stray too far off from Worf, they're asking people to choose which is the real Klingon: Worf or whatever they're putting up on the screen now. The answer will always be Worf is the real Klingon, and the new version is not a real Klingon.
It's just how it is, and it's really insane they tried to stray from Worf too much under the excuse that Klingons were changed previously. Yeah they were changed previous to a Klingon being a regular cast member on two popular Trek series.
DIS season 1 is the worst Klingon continuity issue, but the Chris Pine Star Trek movie Klingons weren't like other Klingons either. Enough so that the fanbase had to start speculating as to how to resolve that inconsistency.
The Kelvin line of movies is 100% non canon in my head. It's good they made a separate parallel universe, so I can pretend it never happened and just go on enjoying the rest of the trek