That should alleviate problems with sending your mails and them not being in the recipient's spam folder. The problem with less common tlds is that some ancient forms don't validate them as actual domains. But this has improved vastly in the last few years. I would say just try it out, it should be fine.
Very similar to my experience. It was even worse for organic chemistry where they just parroted out the outcomes/mechanisms with not much explanation. But maybe it's also difficult to explain chemistry without some solid physics prerequisites
They come with a Linux based OS pre installed. Jailbreaking allows you to effectively become root and gives you a lot more freedom to change stuff.
TLDR: yes