I'm quite happy without either
They are there for operators who like it or need it, or there is some other safety reason or insurance requirement.
The costs outweigh the benefits otherwise.
Any reasonably run aerodrome would want to maximise their movements and keep open as much as possible - as it is what brings revenue to them and benefits the local area. ATC and fire cover protects pilots and protects them too.
It would be a nightmare to attempt to self-sequence at busier places - and ATC has saved my bacon on a number of occasions where my Mk1 eyeball had failed to see.
As for fire, maybe there's no public fire service nearby, so they need something on-site to extinguish the flames quicker, contain the damage, and unblock the runway.
If we don't take part in protecting GA access to infrastructure, the smaller aerodromes will be built over, the larger aerodromes will have exorbitant handling fees and awkward procedures, and airspace will be over-classified to Class A everywhere.