iirc, it is the default for at least some messengers, there is a rough split between “chatty” and “productivity” ones, where we would probably meanwhile chose the “chatty” side, indeed. however, other “chatty” messengers often group messages together, making default-send-on-enter a little less distracting. just saying, as we do not have grouping and this is also no prio atm. the older arguments wrt classic email expectation, otoh, are far less valid today.
however, this thread was originally about different settings/defaults per profile, and that would be a call for trouble, even if we have delete-after-sending, it is unneeded noise.
so, if at all, we should change it alltogether, and i am not so sure about that being an overall improvement.
it is mostly the same few ppl asking for it, most other seem to be happy or do not care. it is also the question if we want ppl to send shorter messages by default. this is what will happen, esp. as many ppl do not go to settings nor know about ctrl-enter. polls here and on mastodon, even tho voters are more nerdy and not representative, also do not justify a change. i heard far more ppl asking for input field being too small in the past, btw, which points to the exact other direction
so, the pressure of outer consistency must be larger than the noise we would produce internally, ppl will get unwanted sent messages, eg new installations, ppl explaining it to their friends etc. so there must be a very good reason.
tl;dr not totally against, but i stay sceptical and would not rush here. it is no prio and things are fine so far