I updated my GW2 install notes https://wiki.realmofespionage.xyz/games:wine:guild_wars_2 (also GW1)
I tested them on Fedora 38, Intel UHD 630 graphics, and GNOME (Xorg) today. I'm using the wine package in Fedora's repo (no Steam, Proton/GE, Lutris, custom Wine build) and afaik other distros should be fine as long as Wine Staging is installed.
As of today (Sep 27th), Gw2.dat is 74.7 GB after -repair and -image. This should be the same on both standalone and Steam, and will likely be less unless you specify -image for the full download. The rest of the GW2 folder is about 300-400MB standalone, will likely be similar for Steam, and Steam also pulls-in a Proton runtime (800MB?) and other Linux runtime dependencies.