You should give https://www.cloudflare.com/learning/ssl/why-use-tls-1.3/ a read. Put briefly, TLS 1.2 supports cyphersuites that make it less secure and requires more roundtripping. It's not a surprise to me that some folks don't support it.
Furthermore, the makers of Minecraft and Grand Theft Auto don't owe you the ability to use outdated OSes if you're using a service they maintain. They probably didn't intend to break your workflow, and instead wanted to make their own stuff more secure.
If you're not a W10 fan, you could always run Minecraft on Linux. I think GTA V works on there as well. Either way, there's an out.
Now Mojang and Rockstar (on azure) have disabled TLS 1.2 on their servers on purpose to lockout Windows 7.
Windows 10 offers NOTHING of value compared to Windows 7.