I don't go that extreme - my employer is free to install their own root CA on devices they own and supply.
I understand some startups are a bit more "Go get your own computer". I think if they paid for it, it's still their device, but once you pay for it out of your own cash, yeah, mdm or root certs are a no go.
I should note that I'm a contractor and I always bring my own tools, which includes the computer. That said, I still prefer to use my own device where I can. It's got the tools I use, configured how I like them, and I'm very familiar with all its quirks which means I have less context switching.
I have worked for clients with tighter regulation controls where I was required to use designated devices for certain tasks but that's been pretty much all of it.
I would rather not have to carry 2 computers around just because an organisation can't trust me to use my own computer, despite having hired me for a substantial amount of money to operate their production infrastructure.
I find having a separate machine has it's advantages, the problem is when IT start managing it they typically so not udnerstand developers and 'standard users' like accountant has totally different needa
I understand some startups are a bit more "Go get your own computer". I think if they paid for it, it's still their device, but once you pay for it out of your own cash, yeah, mdm or root certs are a no go.