Let's see where it goes. Many don't want to contribute to #Mapillary since they were bought by facebook.
But as #maproulette directly contributes to #openstreetmap, I can't see a problem here.
I have a Samsung Galaxy S21 FE which has a lange screen and battery (it works fine for me, only charging to 85%). I have a bulkier spigen case on it, and have dropped it several times yet, no damage.
I have been thinking about buying an S23 Ultra or a Galaxy fold, but I would just risk to destroy more money.
If I would buy an additional device it would be a used 10" tablet for mapping.
Also an interesting approach would be a #NexDock which I never tried, but might even work like a tablet but as screen and input device for my existing phone, which would make switching during mapping more easy.
At the moment I only do #StreetComplete on the go, and maybe #mapcomplete while sitting in a restaurant for example.
Battery does not drain, also I always shut down properly. Still I will double check next time.
You should post your phone, the cable and the charger (specs) Also the soc at the beginning of the charging process.