Expenditure of resource overabundance

Hi everyone, I guess it's more than normal when players eventually come to one day with all troops upgraded and leaving the elixir storages full all the time.

The equality never exist between resources as they portray different proportion of upgrades. What should we do when the first comes to overabundance?

I try to spend my elixir by using troops like drag and pekka but time is really a waste in this situation.

Ideas like resources request/donation, trading system alway pose a threat to supercell's pocket as they have to sell resources via gems and not implementing any of this simply is to maintain their economic growth.

I'm just so curious if any others have ideas that could potentially solve these full-tank problem?

Just seems to me it's a waste that tanks are full all the time and raiding and collectors generation mean nothing.