In this sense, I would like to make a suggestion:
Next to this fee field, place a small message like: "fee automatically adjustable, according to measured sat/byte costs of transactions"

Something like this, just for the user to be aware that this value can change, and choose to do the mix at that moment (because they think it will go up) or wait a while (because they think it will go down).

Either way, thanks for the explanation. Continuation of a good work.