I think what some posters on this thread are missing is that these days a lot of teachers do not train straight out of uni. I didn't, I trained around 5 years after graduating, having worked in labs and also an office based role in industry. I left because I wanted role with more interpersonal interaction, and to feel like I was doing something worthwhile, and also because I wanted to live more rurally.
But I could still go back to that sort of role if I wanted to- indeed, during the pandemic, I was getting emails and phonecalls from recruiters, who were offering me a higher salary to go back to a lab based role, but I felt I'd be letting down my school to leave them at such a difficult time. And ultimately the pay progression in teaching is better- I'm not convinced I will ever see the pension.
When I trained, I was in a cohort of nearly 40 science trainees- I'd say about 60% of the trainees had done something other than an undergrad degree before training- most of those had worked in industry, but there were a couple who'd done masters/PhDs. The distribution wasn't evenly split, btw- most were biology trainees, and then there were <10 chemists, and just over 5 physicists.
Ultimately, several of the cohort dropped out, some more went straight to teaching in private schools or oversees, and just over 50% ended up teaching in English state schools. I obviously don't know where everyone from that cohort is now, but I know that a few more have gone overseas or are looking to, and a few have moved to jobs in industry or for government agencies and at least one more has moved to teaching in the private sector.
I do think a lot of teachers have really good transferable skills, but I think it's really important for non-teachers to realise the stereotype of someone who went to uni, then did a PGCE, then has only taught isn't the case for a lot of new teachers now. People are often attracted by the large bursaries, think they fancy a change, but then they don't all stay.
And as someone who is still "mainscale", it helps me hugely to have experienced people around to ask for advice and support- I think I have a lot to offer my students BUT I wouldn't have progressed so quickly without the help of other, really experienced teachers. My friends from training who struggled the most are the ones where they have gone into inexperienced departments, or ended up being e.g. the only physics teacher in a school as an NQT. It's really hard work, and without subject specialist support, I don't think you develop as quickly.