Do you really though?
Any problem solving industry is going to have flow over work which is not visible.
Even if you're not physically at work, how many ppl are actually mentally checked out when they leave?
How much work is done in the office and how much is left over for the subconscious to decode for the following day?
It will vary by the types of work you're doing, but being in tech as a whole can be quite mentally draining.
The only time I sometimes think of work outside business hours is on bike rides because its otherwise not very mentally stimulating.
If you're building out new infrastructure, doing a huge refactor or stuck on a tricky problem then anyone that naturally cares about their work will have ideas moving around in their subconscious.
For me personally, I'm building my own software, so my asshole boss likes to push as hard as he can :D
If this reply is offensive, I apologize.
I beg to differ. I only do building as a hobby, but the amount of time I spend thinking about how to build things in the shower is pretty much the same as with my tech job.
Again, it may be more about the person than the job
Or eventually get a divorce I guess...