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Measuring RAM usage is extremely tricky, because programs will use more than they need, if there is lots of unused RAM available. Check out https://www.linuxatemyram.com if you want to learn more.
For me KDE Plasma uses over a gig on my main PC after a fresh boot. But it also ran perfectly fine on a 512MB ancient laptop.
Windows 7.
I dabbled in Ubuntu long before.
But when they removed focus stealing prevention, I got extremely frustrated. And as soon as Steam had a beta client for Linux I completely jumped ship.
https://answers.microsoft.com/en-us/windows/forum/windows_7-windows_programs/applications-stealing-focus-reg-key-no-longer/4ee5be7d-31ef-493b-b092-f6f6139f99cd?