This was a crop off the edge of an image, I purposely picked it because it bordered on the extreme, especially the car. LR "guesses" what's behind the car by analyzing the whole scene, and composing an image to replace what you remove. I didn't do it here, but multiple passes (rather than a single stroke) with the Remove Tool will refine the area, much the same way you have to refine a patch or clone stamp in PS to blend properly. I purposely included the original to make it easier to spot places it messed up on, I'm surprised you missed the most glaring (removed the window behind the pole, replaced with shutters). Also, in the original there was no water or rock wall showing around the car, LR created it from a tiny sliver visible under the house. Still had I not included the original or told you what I removed, you'd be hard pressed to see the errors. I've found it to be extremely fast and very good at removing smaller less complex items.
As per above, our editing requirements are very different. On a finished portrait in PS I'll have from 5 to 15 layers on the face group alone, throw in adjustment layers, tone mapping, textures, sharpening, composite layers and assorted other edits, you quickly end up with a large stack, that might take 2-3 hrs or more to complete. I've been doing this many years so "I don't reinvent the wheel" on each edit, my workflow is such that I use actions to populate the stack and perform certain functions, and once I have the first image in a series complete, I copy and paste layers to subsequent images to save time, but many layers like D&B, frequency separations, blemishes, etc., require individual attention.
Yes editing nondestructive is good..... to a point, but carrying it to the extreme, almost a fanatical obsession is not required.