> If I couldn't trust my company on my home network, why would I work for them?

Your employer isn't your friend.

It might be an awesome company to work for perhaps, but it's still a company (unless you work for like a 2 person startup). A company subject to audits and regulations and all kinds of other pressures (some of them actually valid, though many are theater) to monitor and control data and flows on their hardware.

You don't want those monitors etc on your personal data and network which has nothing to do with work.

So, keep them separate is the best possible advice.

Yes my company monitors the network at work and on my work computer, as they must do so.

But they are not allowed to scan my home network and other devices, and they have no reason to break the law. I trust them to not do that more than half of the devices running on my home network.

Many of these technologies have been built in the assumption of a world where they run in the company LAN.

No reason to trust, better to isolate.

My employers laptop is in a separate VLAN. What makes you sure that no-one else than the employer has access to it. This laptop has Windows 10 installed for example. And a shit-ton of McAfee crap. I would trust my employer but not the many companies who have a foothold on the machine as well because my employer is too cheap to install decent stuff on it.