yes USB Audio Player Pro is the best app for android
you get mqa unfold for a few dollars and can log in to tidal in the app, not tidal - so you get full mqa with the ifi.
connected to my ifi xDSD over ifi otg cable, I use my Samsung S8+ or my wifes S10(no batterie drain)
with a 15GB LTE(4G) data plan, we can stream music the hole time on the go - with a dap, you need a wlan connection with making your phone an acces point, you loose a lot more energy
the slow DAPs software (unlike FiiO M11 seems quite fast) would always be the number 1 argument against a dap, for me.
one more item to carry around is also not my cup of tea
I EDC a shoulder bag 7 days a week for going out with the dog, carry around a first aid kit, my 10 inch android tablet, a power bank, multitool, headphones, IEMs, ifi xDSD, Earstudio ES 100, Fiio BTR3 and other stuff like knives and sunglasses… another item to look after, load batterie and keep looking updates… no thanks