- there is still a Microsoft Lumia market & hope that Microsoft will save Windows 10 mobile 📱
As already pointed out several times previously, the fact is that Windows 10 Mobile is already dead, so it cannot be saved. Theoretically it can only be resurrected, not saved, but that will never happen
focusing primarily on mobile apps for the competition can weaken the UWP, destroy the chances of MS edge & much more
What makes you think MS are even slightly concerned about any of that?
the competition will not replace Windows Mobile, not even with the Launcher app, instead the negligence can erase it.
Already happened, don't know why you are using future tense. And it's not negligence - it's strategy. You may disagree with it, but that's what it is.
the Launcher can help Windows PCs remain more relevant, but on the expense of MS Edge & company reputation.
No, the newly launched capability for Android (what is it now, over 80% of the smartphone market?) app mirroring to Windows 10 PCs will do that. You'll be able to control your Android phone and apps from your PC.