Know a lot of people that never change springs. Can't say they are wrong as they seem to get away with it without any serious problmes, but suspect they don't shoot a whole bunch.
I will change springs occsionally, esp. on alloy framed guns. IF the spring a coil srping is showing an unusual wear pattern...heavy rub marks, uneven coil spacing, or bent into a corkscrew shape...it get tossed. Does it make a difference?...maybe...does give a little more peace of mind.
Coil springs generally take a set early on, then seldom loose tension if the spring was made correctly. Long term stroage under cmpression can weaken them. You'd think coil springs would be "forever" but most spring-air pellet gun shooters end up replacing a spring now and again.