Hi @Crankey. Yes,the former Pr/e/mium ePhone S7 has been sidelined by /e/.
I like the S7 too, as well as the S7 Edge. Since these phones are not daily drivers for me but only test phones, it’s easy for me to change OS frequently. The one I like the most is /e/OS. However, it should at least run eOS 9-Pie for the sake of security features and also receive the monthly Android security patches. Since a migration to higher /e/ OS versions is no longer planned, I will no longer recommend /e/OS for the S/ / S7 Edge to anyone.
The GSI ROM tested above on the S7 is an experiment. Whether it works in all important respects would have to be tested extensively. Even the ROM builder will not say for how long a monthly update will be released, because he is only building it out of interest and as a hobby.
If I wanted to use the S7 / S7E as a daily driver, I would install LOS 17.1 for microG, which has been maintained by the developer for years, signed by himself and supplied with monthly OTA updates.