To reply directly to the title, yes there is a need for floor standers in 2022, absolutely. I can't imagine a world where we all decide we rather have speakers on stands in our living rooms, really makes no sense to think that. I also rarely, (if ever?), see bookshelf speakers that come with manufacturer designed and integrated stands, you are usually shopping 3rd party, and by then you are usually paying a lot of money for a decent beefy speaker stand off-setting the cost gains made by going bookshelf. Honestly, unless you are intending to put a Bookshelf speaker on a furniture console or actual shelf in the room, there is zero pros to going with bookshelf, my guess is people who prefer this route do it for very specific reasons, therefore negating the theory that floor standers are not necessary because you have all the other non specific reason holes to fill.
Consider the sub integration side of it, (first of all I think it is easier to integrate with floor standers that can go lower with less distortion/SPL), seems like this is reverse thinking. As speaker sub integration technologies advance, and become more readily available, you somehow believe the theory that integrating a sub by ear with a bookshelf is easier therefore making floor standers obsolete? And if you are using these same technologies to integrate your sub with a bookshelf, doesn't that make both equally easy therefore creating a null and cancelation of your argument?