Look at the folder view in Google Earth Pro in the screenshot in OP. Every folder shows up. Gaia does not display like this.
I will use Gaia in addition to Google Earth pro.
I do not like remote server based applications. While Google Earth Pro desktop needs internet connection to Google servers, the main program and all data is on my hard drive, mucho fastero.
Gaia is superior to ONx off road, as Onx does not allow creation of sub folders like I have in Gaia. I have most stuff sorted by state. In the state folders, I have routes, gas stops, way points. In the attached screenshot of Arizona folder, BDR is Back Country Discovery Route. OTG is Overland Trail Guides.
Gaia's interface in annoying. Using Firefox on PC, Gaia is painfully slow. The worst offense is the sort mode resets to Newest EVERY time after I change sort order to Title / A-Z, then click back. I have a Firefox profile strictly for Gaia. I regularly have to clear Firefox cache when issues arise. The first screenshot shows folders sorted alphabetically, the next screenshot shows Newest.
The Gaia folders in the Android tablet app did not jive with what I was seeing on PC, even though it said "sync complete". I cleared the cache in the tablet app - next time I logged into Gaia on PC / Firefox, ALL my folders were GONE, EVERYTHING was dumped into one folder. Why the tablet app caused this I do not know. Countless hours of sorting, re-arraigning, creating, gone. Fortunately I had exported most everything to .gpx files saved on my PC, most of my recreating time was spent making new folders.
If I export a state folder in Gaia, everything gets consolidated into one file, it does not retain the folder structure. Google Earth Pro desktop does. I save folders created on PC, copy file to laptop, import & it's exactly the same.
I attached screenshots of gas stops & Walmart's in Idaho. After a few uses of Gaia, the waypoints stop showing up in a full state overview, I have to zoom in to an area for them to show up. I have to "archive" the folder then unarchive it to get state overview back.
If a personal situation ends in my favor, I will be selling my house & become a full time RV'r. A side x side is a recreational vehicle.

My Zforce 800 Trail is street legal. Everything I own will be on the machine & in a gear trailer. It is much easier to work on mapping tools using multiple 27" monitors right now at home. If I go full time RV, I will only have the mini laptop.