Windows 7 exists, and there's no need to improve upon perfection. But there's no money in releasing nothing, so they release ad-filled "upgrades" to bring in more money from the doofuses who buy it.
I wasn't using bluetooth with 7, so you could be right. But if I need to fiddle with wifi beyond just changing what AP I'm connected to, the network settings I typically want to look at, eg disabling adapters or manually setting an IP address, were available in fewer steps in 7 versus 10.
This is something Apple got right. OS X 10.0 was good and they’ve made lots of incremental changes but didn’t just arbitrarily change the whole “centered application dock at the bottom and menu bar at the top” situation. When new form factors emerged, they just made a new interface and didn’t try to hot glue a mouse/touchpad OS and touchscreen OS together for the fuck of it.
I would be willing to bet a large sum of money that those machines are corporate owned and running legacy systems that are hanging on by a thread.
Every year someone talks about replacing Ol’ Smoky but the new system would need to go through validation and that costs time and money so they limp along for another year
I would have been happy to pay for continued improvements to DirectX and Vulcan and increasing security and minor useful incremental changes over time keeping the same Windows 7 playbook running. I wish I lived in the timeline where our greatest complaint with Windows is that it hasn't changed very much in the last 15 years.