You seriously can't win with "software".
Thats true of anything. You will never please everyone.
And if we look at the current functionality of EAP - not just specific "feature-sets" that may overlap with other cars - but how well it does each feature and how much that feature improves via free updates over the life of the car, I'd say EAP is worth £4k - if you intend to keep the car for the usual period (obviosly if you want to get a new Tesla Y next year maybe hold off on that)
The *promised* featureset for FSD - not so much.
To give an example, traffic lights were supposed to be done Sept 2019, they just about *maybe* work now in UK a year later. At this rate UK wont get FSD until the early buyers have 3-4 yr old cars. So to get FSD at that point it would make more sense to buy a new car rather than buy the feature.
The equivalet example for you, you would be charging for "all future OS compatibility for life of your
current PC" at x3 the price of your current software. If the OS never upgrades before you buy a new PC - then that feature is worthless.
On the other hand, if you dont want to upgrade your PC for 10 years, but do plan to have the latest OS, maybe it is worth it.
There is really not much point agonising about company pricing policies, if you want the try FSD in UK, EAP gets you there at half the price. Next, year, after the re-write and possible auto roundabouts that formula might change.
A year ago I predicted they will sell off comple features in cheaper brackets. They might create another tier to bundle "complete" features. That would make more sence if you cant transer the license.