Yes and no. The powertrain is big and expensive, but it's a fairly small fraction of the car's complexity. (And some parts of the cabin climate system are probably also high-voltage for power and packaging reasons, but that doesn't change the discussion here.)
But everything else, the instruments, the infotainment and telematics, the ADAS, the windows and wipers and headlights, seats and airbags and lock solenoids, the list goes on... That represents a lot of complexity and cost, a lot of moving parts, and it's all still 12-volt. Partly for legacy reasons, partly for safety. (There was a push 20 years ago to go 42 or 48 volts to make the wire thinner while still being LV/SELV safety, but legacy held it back.)
Plus all the undercar stuff, wheels and bearings and control arms and bushings, half-shafts and CV joints and boots and swaybars, wheels and tires and stuff, that just never changes, and since EVs tend to be heavier, they tend to be harder on all that stuff than their ICE counterparts.
So there's plenty of stuff you can service with good old mechanic skills and tools, and plenty of it needs servicing.
Actually, Tesla is moving to 48v on their new(er) systems. This is a good thing and I can't wait for the rest of the industry to follow them. 48v has been needed for years and I'm glad someone took the first shot at it.
Aside from the things already mentioned, its important to note that "HV parts" isn't always an intuitive category.
For example, the charge port isn't a HV part, since it isn't energized by the car and requires no special skills to replace it. This is useful, since its also one of the most likely parts to take physical damage.
A lot of the other wear items are suspension related and are pretty conventional parts.
And, of course, there's a vibrant aftermarket of used parts for Tesla in general, so even HV parts are not necessarily hard to come by.
I assume HV == High Voltage, if that's the case isn't that basically all the important stuff. I.e. the bits that do the actual automobile things.
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