Even if you’re founding your own startup, keeping IP separate can be worthwhile from a legal and governance perspective.
I find it can also help with getting into work vs relaxation mindsets to configure the UIs a little differently to create a sense of boundaries between the two.
If your two lifestyles are developer (work), and gamer (leisure), then purchasing 2 workstations to accommodate that could be prohibitively expensive.
However, if you're a developer by day, and say, love to work on your house at night, having a decent development workstation, and a simpler pc for browsing ideas and sketching things out, I would imagine that could be beneficial.
It's all about reviewing the situation that you're in, and seeing what fits your income and organizational needs.
Personally, I switched to a single laptop for everything. I purchased a laptop powerful enough to run WoW in the most vigorous situations, and something that maintains a semi-regular keyboard layout and proper specs to build small to medium sized applications.
The biggest downside is that it assumes a data connection, but given the development I'm typically involved in that is largely unavoidable regardless.
I do try to keep the Remote Desktop host clean of work files on purpose, in case it is lost, I quit, the machine dies, or I want to use a different machine on a whim. As long as I have my physical 2F key and a Cisco Anyconnect client I can work from any machine.
If you need a second machine for personal stuff I'd highly recommend a larger screen. A desktop machine seems to be a great add-on to your life.
Benefits as far as I can tell: mental compartmentalization (this is big; I wish I could write this in 24-pt red Impact font), makes writing off the laptop simple rather than having to estimate personal vs. business use.
Downsides: Travelling with two laptops is going to be annoying, expensive if you're paying for the laptops out of pocket.
This situation was kind of an accident for me, but I like it, enough that I might go to the trouble of maintaining it.
if you're working for your own business and there's any chance you might like to sell the business to someone else in future, it might also be a good idea to think about how to decouple the business from the rest of your life. (perhaps less value in isolating laptops than isolating bank accounts, credit cards, email addresses, *aas accounts, etc)