If you buy a laptop with a 4 year warranty, then you can have the keyboard replaced when it breaks, although you will be out for a while. What I do is buy one a year (per purpose) and keep the old ones as backups. I haven't really had much trouble with keyboards other than breaking them myself, so I'm not really sure what you're getting at. Macs have the best build quality but fuck Apple (they are also a bit difficult to repair, but on the other other hand there's a lot of people that know how to work on them because they're so common). Otherwise, I have good luck with Dells for work, and I use Razers for gaming.
OTOH, you can get all the features you are looking for in a laptop in a desktop with battery backup. The main thing you're going to get from a laptop is compactness and ease of portability. The reason most people use laptops is they have some need to travel, and they don't want to buy two computers, which saves money. Perhaps you should look into which laptops have easy to replace keyboards and touchpads if you're worried about it. I'm afraid the problem of not having spare parts is universal.
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