Watch 12:22 and onward and you'll appreciate everything a track blower is capable of:
To touch on a few things you pointed out, from a maintenance aspect there essentially is none. My machine is at least 25 years old, aside from a complete rebuilt and replacement of all the bearings last year and new grease in the sprocket gear housing, nothing else has been done with it. You don't need fiddle with tire pressure, replace flat tires, paint rusted wheels, deal with installing or removing chains.
Slippage + Weight. Well, my little YS-624 isn't a slouch weighing in at around 225lbs thanks to thicker gauge steel and construction that was built to last nor is it anywhere near the heft of a 13+ HP beast. That said, it's still pretty nimble. Will it rise up? You BETCHA! This thing WANTS to climb because of the huge surface area vs a small contact patch. The tracks will dig in and if you don't have the front height adjust locked while keeping the nose down chewing up the snow ahead it's going over your fence if you let it. I'm still getting used to its character, only having used it twice so far but one thing I understand about it, mostly in tackling hard pack, is that you have to have a little upward pull on the handles while giving it the occasional shot of forward drive otherwise it will ride up on the surface. If I hold down on the drive lever, with the auger bucket face full into a heavy bank I'm going nowhere slowly and the tracks will indeed be slipping doing burnouts. There's a reason they put tracks on a snowmobile and not tires.
Appearance, tracks just look AWESOME!
All your neighbours know you mean serious business and have no desire to let winter get you down, that or you have too much money to spend on toys.
I won't disagree that weight can play a role in the performance or characteristics of a machine, a 1028 or 1332 Yamaha is proof of that destroying anything in front of it as if riding on rails, same goes the large municipal street widening snowblowers. That being said, part of it is in how the machine is used. I can't expect mine to cut the first track through the dense and heavy pile left by the plow in one go, it would prefer to go over it than through it. As I mentioned earlier, a little upward force on the handles will keep the nose down and chewing.
One key feature I think would benefit many blowers is having the auger partially exposed for maximum chopping, especially in hard pack. Essentially the auger bucket is preventing the snowblower from moving forward creating a lot more work from the user and time spent.
The only downsides to tracks I've experience so far, on an older machine without trigger turning, is that it likes to "track" straight. Turning on a dime isn't going to happen, especially when maneuvering around vehicles or walkways. Secondly, attempting to move the machine while off. It will fight with you and you will get angry. You can't just spin it or push it out of the way due to the extra grip from the rubber contact on the floor/ground.
Perhaps I got spoiled with my first snowblower being track equipped and a 5 degree sloped driveway but I don't regret it and can't see using anything but, it's like a tank and I love it!.