Very true. I have a beloved Asus Zenbook Ultrabook from 2014 with a 4th generation i5, SSD, 16 GB RAM, retina IPS quality touchscreen, glass lid with aluminum frame, back-lit quality keyboard, Intel graphics only (on purpose to keep it simple and stable for a Linux laptop). I've been running Arch with cutting edge Gnome ever since I got it. Since it is a "rolling" distro, I have never reinstalled the OS fresh and it runs better today then it did back in 2014 due to the open source software improvements. It was my goal for the machine when I bought it and will continue to be as long as I have it. I will admit that I have had a handful of head-scratchers on updates over the years, and early on even had to maintain my own custom kernel for the high quality display to work, but this little Ultrabook is definitely one of my favorite machines of all time!
I hated KDE over the years because of the bloat, complexity, and branding etc. Gnome wasn't much better, but I still liked the look and feel better. I dabbled in XFCE and LXDE, and even other "thinner" environments, but never came away as satisfied as I am with a modern desktop experience. Howver, the "thin" part was necessary for me some cases as it likely is for you. However, in 2019/2020, KDE Plasma is now where it is at IMHO. Plasma is as thin as XFCE any more, check out the article below about the current state of the lightweight desktop.
https://www.forbes.com/sites/jasone...ght-linux-desktop-crown-in-2020/#2eb2798126d2
KDE Neon, while I'm not super crazy about the Ubuntu base, has been fantastic on my 8th gen Intel desktop. I have some widgets on my desktop to monitor RAM/CPU etc. The Plasma desktop sits and idles ~500 Mb RAM of total RAM usage after startup and login. It is simply amazing for such a full featured and able to be customized desktop (docks\panels, widgets, themes, window effects like genie bottle, wobbly windows etc.).
My Arch laptop described above might get Plasma soon, but I'll feel guilty bailing on Gnome after all these years!