a literal corpse on the ground crying out for medical assistance is not exactly immersive
beyond that, chat is already 'out of character' and beyond that blockland doesnt typically have an 'in' character in the first place. players already know how to use chat and (hopefully) know how to communicate with other people well enough that they can get across the fact that they have been shot and need rescue. cropping out extraneous commands and sounds helps keep the game streamlined and straightforward and moreover there is nothing dynamic about a single soundbyte, it'll just get grating
especially if by default even if the player does not actually want to be resuscitated and just whenever they get shot to death, which means medics will hear HELP IVE DIED and then turn around and the corpse is forgetin gone cause he respawned already