Your reading of it is incorrect. If I could be less blunt I would, but
Apple specifically says this:
"Will I pay more than the full price of the device?"
"No. If you decide to upgrade or return your device at the end of your lease term,
the total of your lease payments you made will be less than the full list price of the device at lease signing (excluding tax and any damage fees).
If you decide to buy the device, the purchase option fee is the list price minus any lease payments you’ve made minus any remaining discounts or trade-in credit. (excluding tax and any damage fees)."
What does that mean?
Apple explicitly states that the purchase-option fee is the original list price minus the lease payments you have already made, as well as any applicable remaining discounts or trade-in credit. In other words, the purchase fee declines as you make payments; it is not the same “hefty fixed purchase price” after payment 24 that it was after payment one. If you ultimately buy the device, Apple says the lease payments plus the purchase fee will not exceed the original list price, excluding taxes and possible damage fees.
It works like this. iPhone 17 Pro = $1100 up front (we'll ignore taxes now). You can lease it for 24 months for $32 / month. At the end of the 24 months you will have paid $768. If you opt to buy it (the "purchase fee"), you will need to pay $332 (1100-768). Again, we are ignoring taxes but you will pay those either way (up front or at the end, likely on the whole device price).
Apple also does not “roll negative equity” into the next lease. At the normal end of the term, you return the old device, close that lease, and separately apply for a new lease. There is no negative equity because you do not own the returned device and are not financing an underwater trade-in. If you buy the phone and then trade it in, you are welcome to do that, but that's as much "negative equity" as buying the phone for $1100 two years prior and then trading it in for a new one.
There are legitimate criticisms: you do not own the device after the scheduled payments (unless you buy at the end), early termination requires paying all remaining lease payments [this is harsh, but generally the case with leases], and damage fees may apply (if it's going to be an issue, get Apple Care+). But describing the purchase fee as fixed regardless of how many payments have been made -- and claiming Apple rolls negative equity into the next lease -- is simply a misreading of the terms.
It sounds like this isn't for you. That's fine, but it's not at all like what you're reading it as.