What's so dangerous about UWP ?

This part is correct, although as a UWP app you should be aware that it is limited in terms of what it can do; you can’t develop an XBox One scale game with UWP, for example you only have 1GB of memory to play with on a home console in dev mode.

This is purely speculation.

There are limits as to ‘how low you can go’. A large number of Windows Phones do not have particularly strong hardware when it comes to handling intensive applications like games, and those that do exist do not have particularly deep market penetration (e.g. the new Lumias). ’ hardware is also really not up to par when it comes to UE4.

Yes it has it own limitations, however Xbox 360 or PS3 for example had far less memory and processing power available in general.

But it’s not. Microsoft has talked about it past years and at Build 2016 event they said that later this year Windows and Xbox markets will be merged (or all Windows 10 devices). The current dev mode for Xbox one is for developers to preview/test their apps and games. I’m not sure if everything will be available everywhere in the end but that was the plan.

A lot of the Android phones don’t have either and it’s more wild west than WP is. However I think WP is dying now for sure when Microsoft killed their own production. That does not rule out all the other UWP devices including which will be up to developer to decide how to use the capabilities of the device.

You may have noticed that Unreal Engine 4 does not support those platforms either.

They have stated that the stores will effectively be merged, so that there is only one ‘marketplace’. Software will still largely be device specific (UWP apps don’t magically work on all platforms, nor are they necessarily suited to all of them), and this also does not mean that curation and certification for certain platforms (particularly the XBox) is going away. It just means they’re unifying their currently pointlessly discrete systems.

…but a number of Android (and iOS) devices do and have done for a while, unlike Windows Phone.

ruled itself out with it’s fairly weak hardware; it’s only an Intel Atom x5; the onboard GPU is extremely weak:
http://ark.intel.com/products/85474/Intel-Atom-x5-Z8500-Processor-2M-Cache-up-to-2_24-GHz

If you’re developing for , you’re better off looking at Unity.

I don’t know if UWP would be dead if its as cheap as ambush says. Microsoft’s been very successful with its “Emb, Extend, Extraceinguish” policy in the past, and it likes to get peoples’ guard down before quickly going full aggro.

They’re probably not getting rid of it entirely, since devices like only run UWP