You won't need to carry your work phone anymore, you can just access it in a browser on your personal phone or on your work laptop without any data being shared between them.

Also you cannot lose your work phone as you would with a physical one. Which might be interesting for your employer if you handle sensitive data.

The longer term plan is to also provide an app that you could install and therefore achieve the same mobility. This would be the only work app you would have to install on your personal mobile phone in order to access your work phone. This is still in brainstorming phase.

This makes no sense. My employer provisions me an work phone so that they manage it end-to-end with MDM, and ensure that it stays physically separate from non-corporate assets. If this product just lets me use my work phone on my personal phone, then it completely defeats the purpose, and my employer might as well just allow use of work communications on personal devices.

The work phone VM here would still be MDM managed, have policies enforced, support remote lock/wipe, etc.

It's a really elegant solution IMO.