A good land plane with ripper teeth would be perfect for a gravel or dirt/sod driveway. My driveway is mostly hard pack dirt with old gravel mixed in. We need to have a couple semi loads of gravel brought in one of these years but haven't bothered yet since it's fine besides spring thaw. Anyway, for the driveway I've had the best results with using the ripper teeth on the box blade to tear it up, then level/lightly compact with the land plane. The land plane just floats over the surface without the rippers, even with an extra 300-400 pounds of cinder blocks on it. So does the box blade if the rippers are up, but with the rippers down once the ground is torn up the blade is too aggressive to do any decent leveling/smoothing and digs in periodically. The land plane is perfect though once it's torn up. So basically tear it up with the rippers and fix it with the plane, that's why both in one unit would be ideal. Then drive over it a few times with my truck and it's mint.
Overall size the LX and L are pretty close, but the L is way beefier and heavier duty. Looking at them side by side the axles are night and day difference. More weight on the L too, which helps for dirt work but would be a hindrance for lawn stuff. The loader arms are spaced a bunch wider on the L too, so even though capacity isn't much higher, it's probably much more confidence inspiring to use hard. It's surprising and occasionally concerning how much the loader on mine flexes if the load is uneven. It still works awesome, but I'd expect the L is a lot more idiot resistant. I could definitely see how someone being stupid could damage the LX loader. Since I wanted a double duty machine I went for the biggest chassis with a mid PTO. I'm happy with it, I love this machine. I max out the loader regularly doing firewood stuff, but that wouldn't be much different with an L as you said. It's big for mowing, but much better than I was worried it'd be.
In all reality I probably should have bought a small B on turf tires for my uses, but I've had this thing in enough mud in the back 40 that if I had done that I'd be wishing I went more aggressive. The slightly smaller machine would be slightly better for mowing, but the ~20% lower lift capacity would piss me off doing loader work. Can't have a multi-use machine without compromising somewhere. I'm gonna be switching from R4 to R14 tires sooner or later though. I'm very happy with the traction of the R4s besides when plowing with the back blade angled, then it slides sideways a lot. I was about to groove them to resolve that when I decided to call the dealer and see if they'd swap them for R14s. People rave about those in the snow, plus it'll be easier on the lawn when turning, which is the only time I have problems. They've got some on order but unknown ETA, and the cost to switch is very reasonable. Even with ~85 hours on my R4s they look damn near new, so they'll be able to toss them on a different machine to sell. I wouldn't have been at all upset if they told me no, I would have just spent a few hours with the groover for snow and had to continue being careful turning in my hilly yard in grass.