Microsoft forks Unreal Engine 4 and ports it to Universal Windows Platform

Where? They go for $700 at the most on for sale forums.

In theory. Obviously if not adjusted some, user experience suffers. But the idea is to make it so easy to adapt to different form factors, it just seems normal to. (People expect these days that their Android phone or iPhone app will work well on an Android tablet or iPad, for instance.)

Confirming something exists narrows what someone looking to find out something secret has to look for. If you know what my username is, you only have to guess passwords for that username. If you know what my project name is, you only need to look for references elsewhere to that project name.

Just knowing the project exists could be telling, if your project was like... github.com/apple/nintendo-igameboyphone it would potentially be a really revealing thing if you hadn't announced it yet. Slack had a big fiasco when entering a fake @whatever.com address would let someone see whatever.com's teams prior to email verification. From just room names alone you could discern some potential acquisitions in negotiation, teams at Microsoft or Apple you might not have otherwise known existed, etc.

Developers' efficiency. But MS understanding of "gain" is a crooked one. They want to prevent developers from releasing anything for the competition, so they use tools to make it harder (lock-in tactic). Or if they can't prevent it, they want to tax it (i.e. to make it more expensive). It is clearly crooked.

And I don't mean just to make Vulkan better. I mean MS starting supporting it instead of DX12. Same AMD can produce Vulkan support for them for Xbox quite easily.

DX12 is a form of lock-in.

Many people don't want Console/phone like restriction on PC. Sweeney feared that MS will try to force everybody to use UWP, and later MS will change UWP policies. But then it will be late for everybody move away from UWP.

How many people you know downloads the apk on their android phone to get the app running? Do you have any say on the Google Play policy changes? MS will certainly repeat how convenient UWP is, but people are reluctant to trust MS because they don't know how MS will behave in the future.

That's what Tim Sweeney fears. Phasing out the open nature of the ecosystem, and replacing it with a locked down one where MS controls everything.

And that's a lock down. Maybe it's not for malicious reason, but people have enough reason to hold on onto the open nature that drove the growth of PC gaming(and malware). Secondly, when they don't know if MS will keep their words.