I've now found myself using nothing but cantrips and save scumming because I cannot tell if I will need to use stronger spells later.
In the same fashion as how a lot of players often stock up and never use consumables.
This reticence to use resources is a classic problem in video games. The problem is exacerbated by the 5E ruleset, which has loads of per-day limits. In my opinion, they should move almost everything to recharge on short rest and make short rests much more available. What's the current limit? 1 per actual hour?
The UI around short rests needs a lot of work. How many can I take? Why am I not currently allowed to take a short rest?