Never, ever, ever ever use your personal laptop for work. Never use your personal mobile for work unless you have MDM software.
No employer with a functional legal department would ever be okay with an employee using their personal devices for work (unless they have MDM software on the devices partition the work data).
Using your personal device(s) work for make them fair game for discovery in lawsuits, even after you have left the company. It is also generally a violation of state and federal laws and/or procurement contracts in multiple fields if you work in finance, health, or anything defense-related.
If an employer ever mandates that you use your own device for mandatory work-related functions, find a new job. It's the number one red flag that the company is a shit-show and indicates that there are a lot of other rules/regulations/etc that the company doesn't care about either.
I agree with most of your points but:
> No employer with a functional legal department would ever be okay with an employee using their personal devices for work (unless they have MDM software on the devices partition the work data).
This works the other way as well. While I (as an individual) have no legal departement, there is no way I'd ever be ok allowing work to touch anything on my devices, MDM or not.
My devices are mine, they will contain zero work stuff. Any device that workplace wants me to use for work, will be provided by the company, not me. I'll never allow any overlap.
(20 years ago I was at 100% overlap, no boundaries at all, but times have changed.)