Depending on who you're subscribed to, this might not make much impact on your browsing experience. Due to titles being crowd-sourced, not every video will be equally affected. Sometimes, the suggested titles can get REALLY pedantic for otherwise perfectly serviceable titles. For example, "The History of The Simpsons Hit & Run World Records" by Summoning Salt became... "The History of The Simpsons Hit & Run (All Story Missions) World Records". Like, that's *barely* more information, and it's stuff I think most people would've assumed anyway from the original title. However, in both cases I've seen this happen, they've reverted back to the original titles soon after. (There's not even a record of there ever being a proposed title, so you're just gonna have to trust me that they were there. I know what I saw.)

Generally, they make the biggest difference with channels like Kurzgesagt or Tom Scott, creators they specifically showcase in the screenshots. Titles can be a bit of a mixed bag for others, but more for the fact that not every video - that might need a retitle - will get them. The generic thumbnail replacer makes the bigger difference to me, imo. It just gives you an honest impression of what each video's gonna look like, literally. And it's nice not having to deal with the obnoxious, gaudy thumbnails people put out sometimes.

Despite the occasionally questionable re-titles, I think the crowd-sourced titles are decent and in good faith. I appreciate the number of guidelines the devs put out to even propose a proper title. It sort of feels like Wikipedia - it might have its vandals, but collectively I think it's in good hands.