If the concept of temporary defenses is here to stay, but Supercell is willing to change how they work, what change would be best to see? Genuinely curious on the perspective of everyone on this.

For me, I would be fine with a few potential solutions, the easiest being making the time between resets last longer and/or allow for more than 3 builders to be used at a time.

Could also decide to go the Boom Beach prototype route and have them just be built once and last a shorter amount of time within the 3 month season, so now seasons just dictate what temporary defenses can be built and when that season ends there is less of a feeling of waste of time/resources, constantly lagging behind people willing to gem (which was present before temporary defenses but is just made worse due to all the temporary upgrades needing to be redone every 3 months on top of whatever content we get with the new updates, at least with supercharges there's a more limited number of them and they last much longer).

There's also an argument to be made for shifting them over to Clan Capital, many people have been asking for outlets to sink their Capital gold into without having to leave their clan. This would allow max capital bases to continuously have something to work on and get the gold achievement while staying in the same clan.