More Options for Backwards Compatibility

This probably comes as no surprise to most Xbox players, but it would be really nice if we got more backwards compatible games. Now, I understand many of the reasons we can't have certain games due to licensing, software, ownership, company rights, etc... However, my question now is why don't we have backwards compatibility for games that don't have most of those issues. For example, I recently got a Xbox Series X as an upgrade to my long-time ownership of an Original Xbox, however, to my disappointment, many of the games in my collection that I thought would be playable were not. Out of my 27+ Original Xbox games I am understanding for most (as per the issues I mentioned), however, for titles such Halo: Combat Evolved (Platinum Hits and regular edition), Halo 2, and Fable: The Lost Chapters, I feel those are capable of playing on current generation consoles. Especially since they avoid many of the problems I listed, except for maybe software and compatibility issues. On top of this, since Microsoft has already made remasters of these Halo games with their Anniversary line, as well as what Playground Games did with their 360 Fable Anniversary, I am utterly confused on why they can't apply that to their original counterparts. And what (to me) makes this even more dumbfounding is that the remasters of these titles incorporated very little changes besides those of graphical improvements.

So, I'm done ranting, I just feel Microsoft and Xbox have the power to allow at least a few more games to work on current generation consoles, which, if done, would surely make many fans happy.

Side note: I would think making backwards compatibility exclusive to the Series X's would encourage more past customers to upgrade their console(s), so long as Xbox chooses to make additional backwards compatible games exclusive to the Series generation...

:)