If the first thing you will do is receive from lightning, you must somehow obtain inbound liquidity. Phoenix offers you to do so with a fee.

You could also buy a larger liquidity package to face a smaller relative fee and have a nice big fat channel that would allow you to forget about the topic for many transactions, potentially indefinitely.

pillar

I tried to use Phoenix before, but am I right to say that I must fork out ~7700 sats first to open a channel? 

cryotosensei

bitcoin

UX Experience: Bitrefill

I would advise you to try Phoenix. It should provide you a much better experience that Muun without any drawbacks.

Muun is a bad wallet for many reasons. There's always a better wallet than muun, regardless of what your needs look like.