Getting rid of echo is as simple as flashing SFOS over Sony’s stock Android 13 (instead of 11). As a bonus, display tint / color banding is gone, too. After 2 months of use, no single side effect or problem with using such combination.
Yeah… Will we EVER see it on SFOS? It is heavily underrated, especially when 4G support on SFOS is still crap, and many 4G networks themselves are a mess. I have to switch my 10 III to 2G whenever possible to avoid permanent 200-500 mA power drain on 4G which eats battery within <1 day and heats the device to constant 30-35 degrees Celsius.
I don’t buy things I don’t need. I won’t pay any kind of subscription, either.
“You” is a handful of people willing to pay such exaggerated amounts. Majority either do not support subscriptions at all or are able to pay a few euros at most, which in the best case would equal the amount of current one-time payment (assuming that the user wouldn’t stop paying monthly fees earlier than after 2 years or so).

