I'm astonished some companies push the "user your own phone, which we now basically can control" angle. I mean, that's really shitty.

I've been working for the same small software shop (single owner, and I trust him) for 14 years, so the entire development of the modern mobile ecosystem happened while I've been in this job.

I use a personal laptop for all my work. I do this because I have Strong Preferences, and there's no way for the company to interfere with my computer. I can say this because (a) I trust the guy and (b) it's not actually possible for our corporate stuff to affect my personal stuff. (My computer isn't on the domain, for one thing; for another, we've all increasingly moved to "remote desktop into a VM in the colo" as a work pattern, even the devs, because it puts us all closer to the app servers and database servers. What device we use to reach the corporate environment is increasingly irrelevant.)

But this is a post about what OTHER people should do. Most people aren't in my position. Anybody who works for a big corporation -- which I define as "anywhere your boss has a boss" -- should absolutely assume that Bullshit and Chicanery Will Ensue at some point, and treat your personal computing security accordingly. Don't cross the streams if you can at all avoid it. If you must, minimize exposure.