If you have hardware synths you are going to have a decent midi and audio interface that this is not a problem. It wasn't even a problem 25 years ago. There is no reason for consumer grade audio to be able to do this because most people will never use it.
These opinions are not helpful.
I have maybe 20 hardware synths and I do a lot of sequencing. And yes it wasn't a problem 25 years ago, that is exactly why I still use an Atari STe! :-) But today it is a problem. It is just not possible to do complex and tight sequencing today with a normal Win, Mac or Linux computer. Even with my RME PCIe card. Your argument, "it wasn't a problem decades ago, so it cannot today either" is simply not correct.