QAs will read them during Post-Release Support periods and occasionally forward it to Code, but most reported issues on Linux are caused by imperfect setups (improperly configured swap, drivers, OS) and we cannot do in-depth troubleshooting of such issues on all possible Linux distributions.
Properly configured Arch running proprietary drivers and meeting the hardware + software requirements should run V3 fine (in fact, telemetry shows more active players running Arch and SteamOS than Ubuntu as of this month).