As I understand, it doesn't even have a motor? Why cannot we have an electric wheelchair for everyone today? How do you climb uphill (or from an underground passage) without a motor?
Also, I don't know anything bout wheelchairs but googling shows that there are Chinese electric wheelchairs below $1000 (don't know anything about their quality).
If it's a lightweight wheelchair custom to your body measurements (not a cheap amazon product) the going uphill is fairly easy. There are also attachments like the SmartDrive for steeper grades.
Unless you don't have function in your arms, it's best to avoid a fully electric wheelchair.
Traditional power chairs are much bigger and heavier than lightweight manual chairs. They're a nightmare to transport unless you have a custom van with an elevator. They also can't handle curbs.
Ultralight manual chairs are often foldable, and light enough that you can transfer out of your chair into the driver's seat of a car, take the chair apart and put the pieces in the passenger's seat of a normal sedan. That level of independence is huge. Also, you can pop wheelies over curbs and other obstacles.
Finally, pushing yourself keeps you in shape, since you miss out on the baseline exercise from walking. Otherwise you decondition and get weak and fragile. Power chairs are for those who can't push themselves sustainably.
As many others have commented, every user's disability and body is unique. You're spending 16 hours a day in the chair. If it doesn't fit you, you'll get pressure sores or strain injuries. The cheap ones are for people who don't need to use them that much.