Microsoft has a much bigger push for quality over just putting something out no matter how broken it is, If this purchase was pre FO76 it likely would of been pushed back another 3 or 4 years if not just outright killed given all the bugs and anticonsumer bs they pulled.
Whether they care about quality in their own walled garden is irrelevant, if the whole thing is anti-competitive. Besides, it's natural for quality to only degrade, as the level of monopolization grows. Monopolists don't care about quality because users have less and less choice but to use them. Quality is driven by competition, not by market consolidation.