A few not so common questions from a noob - sleep, living quarters

Some more newb questions. Trying to get a sense if the industry is really for me. I understand every boat is different etc but just looking for some generalizations, I’m in the dark.

How common are 28/14 schedules? Would you say half the mariners out there work that? or is it a small minority? I could do the 28/14 for a few years but not really looking to do that for 30 years.

How common is it to stick with the same boat or schedule for years? I would imagine tug schedules are pretty predictable but I talked to one Mariner and he told me he never worked anywhere longer than a few months. He seemed squared away so I don’t think it was because he was a flake or was fired a bunch. And he wasn’t complaining about a lack of work. Is this typical? I kind of like the idea of changing jobs a lot.

What would you say is the rough breakdown of the types of vessels mariners work on? i.e. what percent work on tugs, in the oil industry, MSC? bulk carriers are almost all foreign I am presuming? What am I missing?

Thanks appreciate the assistance.