I agree that most varanids are kept suboptimal.

Too cold and the wrong feeding regime.
Our various species are kept with 70C basking spots they have to climb to get to.

My rule of thumb is that if they are directly under the lights for more than 15 min, it is too cold, They should only bask a bit off center and not for super long periods.

It should be bask-cruise-bask-cruise & They should be always moving around and be lean with well defined muscles.