I use optical drives (which aren't nearly as obsolete as Apple thinks they are)
You’re presumably referring to the “PC industry”. If we take the average PC as a guide, PS2, DSub VGA and Parallel ports are probably not “obsolete” either.
It’s time to move on. I’m sure there are niche purposes where optical discs actually make sense but I’m also sure those very much are niche purposes. Note that I’m not saying people don’t use optical discs. I’m saying they’re hardly ever the best tool for the job. 0 surprises most PC manufacturers still include them, leading from the rear as usual. I wouldn’t be the least bit surprised if those same manufacturers also include 3.5” floppy drives too.
It is really not an issue! You don’t need to worry about a fat laptop. Apple should add the port, and seriously, it will not add much to the heft, you will still be able to carry it with you just as easily
Ethernet ports on laptops is almost certainly a niche requirement in 2021. A good portion of those who want it, likely want 10G anyway. Tb3 ports provide for that, even dual 10G if you want. Or in a dock, so it’s a one cable connection for power, video, Ethernet, etc.
FYI this is how the end of your post comes off to others:
A small hub or adapter is not an issue! You don’t need to worry about it. It doesn’t add much to your bag, you will be able to carry it just as easily.