The limit was never 120 - it was 140 but has been 280 for ages. About context, on Twitter itself you see tweets from accounts you follow or that accounts you follow have re-tweeted (and some suggestions based on accounts you follow) so the context should be obvious. If it's some random post on a site outside Twitter and it's worth posting on its own, there'll be a link to context embedded in the tweet otherwise it'll be a thread or whatever. If not then it's not worth posting unless the target audience will understand/appreciate it.
What @Wij posted above is perfectly understandable and the context is right there. Musk has been on some ultimately pretty dull and uninteresting crusade to "own the libs" with "The Twitter Files" ("both political parties were at it but REEEE HERE ARE ALL OF THE DEM LIES IN METICULOUS DETAIL") and the tweet above is a response to that, highlighting that the "journalist" has questionable background/motives (as do the "journalists" of all the other Twitter Files).
What @Wij posted above is perfectly understandable and the context is right there. Musk has been on some ultimately pretty dull and uninteresting crusade to "own the libs" with "The Twitter Files" ("both political parties were at it but REEEE HERE ARE ALL OF THE DEM LIES IN METICULOUS DETAIL") and the tweet above is a response to that, highlighting that the "journalist" has questionable background/motives (as do the "journalists" of all the other Twitter Files).