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Furthermore, the makers of Minecraft and Grand Theft Auto don't owe you the ability to use outdated OSes if you're using a service they maintain.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.