Ya this is all true. Just from my own perspective I guess, even though I follow these things and generally know before the majority of the public, I find it wild how Disney hypes up their attractions for years. Guardians was announced in 2017 if I was correct? Not getting it until 2021. Thats a lot for me for a coaster, and the hype dies down. Might just be a me thing, but ah well.
Universal I'm thinking will start to get more consistent at their Orlando resort doubles, but so odd they announce some attractions opening dates on the day of, but Epic Universe is known 4 years out. Again new park >new attraction, but I think we all can see the inconsistencies.