I hear complaining about the decay timers and yes to an extent they could use a little tweaking.
My suggestion is to make decay timers progressive.
Say something starts to decay at 7 days. Instead of clicking and poof maybe add a scale of decay.
On day 8 say, damage is increased 20% or whatever number to be fair.
After 10-12 days the structure can just be deleted
thoughts? This seems like a happy medium