I was at boarding school late 70s/early 80s. On balance, it was great, but I bet schools are very different nowadays.
Academic standards were high, with excellent teachers and small class sizes, and it very much instilled a work ethic and routine, because you were surrounded by your classmates 24/7. I got into Oxford as a result of the teaching standards.
Boarding routine - we were all in houses with mixed age groups in each one, with a housemistress to supervise. Dorms to start, then rooms for 2, then your own room in some cases. Tight structure around routines and tasks in each house, but in general it was like a giant sleepover - so much bonding.
Very heirarchical....every year knew their place, older children bossed around the younger ones, but also took care of a lot of the pastoral needs too. Minimal bullying, in my particular school, and it was dealt with mainly by peers. Awards and privileges earned as you moved up the school (or taken away for bad behaviour).
Strict environment - silence in the corridors, stand up when teacher enters the room.....
Food was pretty beige, to be fair. Lots of stodge. Snacks would be bread and jam, that sort of thing! Not unusual in the 80s.
Boarding school taught me a lot about resilience, being able to get along with other people in close proximity, and independence from parents. How to conform and obey rules (sorely lacking when I arrived, fresh out of a sink comprehensive school), and how to be confident.
It doesn't suit everyone, but it worked for me. I didn't really miss my parents (had a bad relationship with stepdad at the time so I was happier out of his way).