Ah, I see. The oldest software I use is a game from ‘99 but it runs fine.
That said, the problem is that your software and hardware are old and haven’t been updated. That’s not Microsoft fault and shouldn’t stop them from updating the windows kernel to make it more efficient.
Or you can just use a pc not connected to the Internet for work. And you can build an older model using new old stock.
Old software is running fine on my Win10 machine too, but the machine was built for Win10. If the machine wasn’t built for Win10, there are drivers that may not have equivalents in Win10. I know of many people who couldn’t complete the update.