That is the bane of my existence. Steam's UI is so slow to react due to its web roots, that I feel like people must be insane to think that Steam is somehow this great app. It's terrible.

I shop on GOG.

Steam was rewritten in React relatively recently. I think most people formed their opinion of Steam back when it was mostly developed in VGUI, the same in-house native UI framework Valve used in games for stuff like the Half-Life 2 title screen and the TF2 server browser.