This is one extra thing I don't like about Epic store - Valve has a Linux client & hosts many Linux native games, is active in many open source projects including GPU drivers and even actively works on improving Wine/Proton to get Windows games run seamlessly on Linux.
Epic does nothing like that and even actively pushes games to be exclusive this Windows only, using their Windows only client.
Just to be clear, it took Valve 10 years to add support for Linux. The Epic store has been out for a little over a year. I have no idea if Epic will eventually support Linux, but I find it hard to fault them for lacking things that Steam has when Steam has existed for 17 years now.
Epic also owns one of the largest "anti-cheat" software companies. That refuse to support linux, or work with Valve on making it work on proton.
There are quite a few games that work great with proton, but can't be played online because the anti-cheat won't run. Like Arma3. It runs great in linux, but the binaries are always 3-6 months behind the windows ones. so your choice is to find a server with 2-3 people on it, or run it on proton, see lots of servers with hundreds of people, and can't connect.
Epic does nothing like that and even actively pushes games to be exclusive this Windows only, using their Windows only client.