As Balmer put it: developers, developers, developers.
In other words: the purpose of (consumer) Windows isn't to make money for Microsoft; the purpose of (consumer) Windows is to create a sales channel — "Windows users" — for Windows developers like Adobe to sell their Windows software products into.
Microsoft then makes their money off those very same Windows developers, through corporate Windows licensing, Office subscriptions, Azure, etc.
As such, Microsoft tries as much as possible to avoid "bringing in" any features that are currently being sold as products by companies in their developer ecosystem (which would deprive those developers of revenue, and thus deprive them of revenue.) Acrobat charges to rotate images? Better not offer native image rotation.
This is the impression I have from Wordpress as well. Some of the most basic features you would expect a blogging platform or a brochure site creator to have out of the box are conspicuously missing, and I strongly suspect the reason for their absence is NOT for the sake of keeping the base WP install small, but rather because there are paid plugins in the Wordpress Plugin Directory which fulfill those basic functions, thereby providing a marketplace to incentivize WP development, regardless of how basic the functionality that you're looking for is. There is indeed a vibrant WP marketplace as a consequence of this, but should I really have to install a 3rd party library to get simple modal windows? Regardless of how much popups suck, they're something that every commercial client asks for at some point, and instead of having a single way of doing it which is official, well-maintained, and trustworthy, you have to shop around and try out every mystery devshop's kneecapped freemium version, many of which pelt you with banner ads and/or conflict with another shitty-ass plugin! It's very much a developer-centric way of doing things. Fine, that's a worthy cause, especially since Wordpress is free; but more often than not, the best solution is to invest in one of the plugin "suites" which do more than one thing without interfering with other things. As much as I like composition and "do one thing and do it well," if you try to go down that path with Wordpress plugins, you're asking for it.
In other words: the purpose of (consumer) Windows isn't to make money for Microsoft; the purpose of (consumer) Windows is to create a sales channel — "Windows users" — for Windows developers like Adobe to sell their Windows software products into.
Microsoft then makes their money off those very same Windows developers, through corporate Windows licensing, Office subscriptions, Azure, etc.
As such, Microsoft tries as much as possible to avoid "bringing in" any features that are currently being sold as products by companies in their developer ecosystem (which would deprive those developers of revenue, and thus deprive them of revenue.) Acrobat charges to rotate images? Better not offer native image rotation.