Nintendo had Satiliview as well. Xband allowed Genesis and SNES to play online. Some games supported it like Street Fighter II. N64 and Dreamcast had DLC for games like Mario Artist and SEGA's Skies of Arcadia. Famicom was online. Every Nintendo home console has had the ability to connect online. While not from SEGA themselves. The first dual analog controller came out in 1989 for the SEGA Genesis. https://segaretro.org/XE-1_AP
There are hundreds of examples of hardware or services in gaming well before their time.
You know, I think this is an important distinction. There will almost always be some remnant of technology that was produced before it became mainstream. I think that these are the trailblazers, but what is important to gaming history are the ones that took that concept and had it stick.