I can agree with you even from 4 years ago and older from a post I made before:
(don't mind if it wrote like **** I've been writing like that before, also maybe the link might not work straight so you might need to copy-paste it to access it)
I believe it still applies thought. But now what? You start to kill off the store and its support also, with your own products? You seriously find this good Microsoft or what? Atleast do something good for once please and unlock the firmware or add some proper support or even allow programs, which were designed for other architectures CPUs (x86 mainly) (which Windows 10 on ARM has that I think) or something properly done for the tablet if you really plan to kill the support for it. I don't believe it's impossible. It's like we wasted money into NOTHING literally and it becomes useless because of bad intentions from your part, while atleast for us it can be a pretty useful piece of device if you'd do something good for it as I said above some good examples, while different people from different forums could do something for it (unofficial support), even after end of its official support. Even althought before we could get good apps and games from the store and it was something, but now the store, even on the Windows 8.1 full itself it's useless as everything almost is no more there unlike it was before, and I don't just get it still why it was killed off that early.
And one more thing to add, if you find an excuse or as a reason that it could be "unsafe" from 3rd parties or to do for the firmware and such, please don't mind it, it is afterall our device and if we brick it, that's it, we got it with our money afterall. But come think of it, it is better to just stay forever locked into something that you wouldn't be able to do **** for it later and call it "secure" or to unlock it atleast to make something from the tablet?
Come to an example for a bit also please, even if may sound off-topic: there were many Android phones from different companies that were abandoned, yet atleast they still had unlocked firmware support for them to allow different users to install different ROMs for them unofficially and still were worth it, which can be the same thing with Microsoft and its mobile products if you get your **** together (no offense), despite it might be a different story from the example I gave.
Well, I REALLY hope someone read it and give it some further opinions or comments for it or EVEN forward it as I hadn't wasted time like nothing writing it and thanks you nonetheless if you read it and even share / forward it.