You may not have to today, but you will one day. They will remove zone.js and there will be a whole host of deprecated libraries and outdated blog posts about how to do things the “angular” way. If the vite dev server didnt feel so much snappier, I would lament it, however, I think overall its a nice change.
And sure, just change components while you are in there, but this is for my blog libraries I work on in my spare time. A lot of the standalone stuff just feels like change for change sake and the scripts did not run against a library project. I tried to dig into the @angular/cli repo to try and figure out what was going on, but after reading a few classes noped out and just converted by hand. Only takes a couple of hours or a day to test, but thats 0 productivity time. Change detection is different now and leveraging ngOnChanges is def broken now, zone js removal is experimental, and all of it so Angular becomes more like React as far as I can tell.
My new projects are Django with templates and post backs. Its a breath of fresh air.