I only have small tanks (25 and 60 liters). No matter if they are low or high tech, I always change about 40-50% weekly... I find it does well to the tank and it is a relaxing time for me.
The only difference is that when I'm going low tech I can perfectly skip a week if needed and water changes are very low time consuming... I just clean the glass once a month or so, no need to trim so often. So water changes are literally "changing water" (which in a 25 or 60 liters can take from 5 to 15 minutes). In my high tech water changes I usually have to trim, clean the glass with a sponge, syphon, etc. so water changes entail quite a lot of maintenance
Jordi