Why the fck is it so hard to make a decent client?

Shit riot fix your god dam client i keep getting this stupid ass firewall message and i know for 10000000000% that it is not my firewall causing the problem or my internet or my comp cause every other game i play (Smite, Dota, Wow, Tera etc.) Works perfectly fine! Omg wow it does :D? Yes every other dam game works fix your client. Billion dollar company.. Most played game in the world. Yet doesn't even have a decent working client