However, have you guys ever thought that what happens if that phone never turns on the next time you want to access the Mycelium or your desired wallet on it?
Things like this happen at some point and there's no cause for alarm since the wallet is backup offline in multiple places but I will advise you to be more careful with the use of a mobile wallet as storage.
Would you keep importing your wallet every time you buy a new phone or laptop for that matter?
Yes, it is what it is. However, I always advise people to always go for the best equipment if it is something they want to use for crypto because a little could lead to huge losses.