10 years ago we had CSS minification, primarily to reduce the number of web requests. As a .net developer it was simple, you point it at your css and it combined and compressed it for you. Now the minifying is all about compiling to css, you have to run a node server to do it and the results are still more bloated than 10 years ago. Web development went off the deep end.
The results are from including all of bootstrap, even though you only use 3 parts, plus a theme that doesn't do a custom build, that overrides it all, then a couple other components with their own huge CSS, even though you're only using 1.
Without being judicious, it's easy enough to see happen.
Not to mention a few resource embeds to shave load time (fonts, svg, images, etc).