Yes, battery degradation is a serious problem. Having to recharge daily means reaching 400 recharge cycles in just one year. Which is unacceptable, considering that the 10 III easily withstands 3+ days with stock Android.
Sadly, Jolla don’t give a flying **** about 10 III power consumption on SFOS (not just this enormous drain on 4G but exceptional power hunger in general, as even on 2G it still eats 2-3x more power than eg. the XA2 Ultra) . I can’t recall a single comment from them regarding this issue, not even that they’re looking into it.