I do say things like that about Windows too, and I back anyone who writes a blogpost excoriating Microsoft for their longstanding faults. As a long-time Windows user I can definitely say I am used to mediocrity in many areas. Thankfully no longer on a daily basis :-)
Some of the GTK filepickers on my system do show previews (e.g. Signal) but others do not (Mozilla - since fixed by the incantations needed to have them use KDE's).
Some of the GTK filepickers on my system do show previews (e.g. Signal) but others do not (Mozilla - since fixed by the incantations needed to have them use KDE's).