Female mosquitoes bite to produce eggs, male mosquitoes feed on nectar and pollinate plants. Some orchids can only be pollinated by mosquitoes.
Only a small number of species (single digit percentage) go after mammals. And even less than have been found to be vectors for disease.
The basic point is that yes, we can wipe out selected mosquito species via eradication programs (like sterile mate release) with zero consequence outside of healthier people, because human hazardous mosquitos aren’t unique to the ecological niche they fill.