As people said above, if there's a problem with the website then the solution is to fix the website not keep trying to manufacture a 'solution' whereby Galaxy only looks relatively better by making the website artificially worse. If GOG's website is slow, times out, etc, that doesn't just affect downloads, it affects the whole "first impression" experience before someone's even downloaded Galaxy. For every person doing what you claim and saying "this website sucks but Golly Gosh I'm sure the client is miles better", in reality there's probably 5-10 others who instead just instantly close the browser tab and go straight back to Steam. "Mission Accomplished" at 'converting the holdouts' via an unnecessarily neglected website? Not really.

GOG have been hyper-aggressive in pushing Galaxy for 9-10 years now (remember this?) and if Galaxy has "succeeded in bringing in most gamers who want a client", "Everyone uses a client these days, even GOG users", "most gamers want one even GOG gamers", as you keep claiming, then where are they when it comes to GOG's bottom line? Why is GOG still scraping barely $9,000 profit per quarter ($3,000 per month) after 10 years of constant Galaxy adverts yet ending up making less profit than itch.io doesn't sound like "the client has brought lots of new gamers to GOG" at all. It almost seems like in reality, most people using Galaxy are pre-existing GOG users (who'd still be using GOG anyway even without Galaxy due to DRM-Free), that the vast sum of development money pumped into it still hasn't paid for itself (including needing a secondary set of Galaxy game download servers (non offline installers), cloud save servers, achievement servers, Galaxy development staff, the whole Galaxy SDK / API and related documentation, more CS staff, etc) and maintaining a website in an unnecessarily primitive state as a "negative advert" to all that isn't really attracting anyone new to the site in significant numbers in actual practise...

Look at what someone posted here (click on the first 2 links in the bottom paragraph). If such an improvement can be done by one person in 30 mins, then after 8-10 years of not doing so since the last makeover, "Just use Galaxy" is a very weak excuse rather the "solution". Bottom line = if there are website problems, then stop messing about and fix those website problems (like every other online commerce business does...), with or without a client.