As many have said, most modern SEGA games are built to target the PC or PS5.
One thing to keep in mind is that, wherever SEGA fumbles, the fans are sure to follow with something special. Especially for Sonic. I’m a console gamer through and through, but it would be foolish to not let you know the amazing things you can play on even a lower end computer. Mods for the Sonic Adventure games are some of the highest quality fan mods I’ve ever seen. Restoration work to Dreamcast classics like Crazy Taxi. I’m fairly sure that even the Steam release of NiGHtS has fan made mod support.
SEGA may abandon and mistreat their amazing software history, but the fans love it. And many of them cherish presenting it in the best possible way. Do a Quick Look around and you’ll find some amazing stuff. Don’t discount the PS5 DualSense though! It’s rather expensive, yes, and does have unreliability issues, but it’s my favorite controller I’ve ever held, with both features and feel that I can’t imagine playing certain games with almost any other way.
One final note: emulation is your friend. Do not believe the rumors that emulation for systems like the Saturn require high end hardware. That nonsense narrative only applies to systems like the PS3, and stronger hardware from the eighth generation and above, thanks in large part to reliance on stronger CPU hardware to handle accurate computations. For any and all SEGA systems, as well as many of their arcade games, doing research and putting time into setting up an emulator properly is the best way to go. This is not to dissuade you from a PS5, as I still believe many of the games Sony has ported to PC are still best played on the system they were originally designed for (without PC port technical issues and unwanted Sony registration), but for SEGA stuff, the fans do what the company itself does not.
And yes, that applies to their modern titles. Mods are there for them too. Have fun!