Can I submit my affiliate links to directories? Or at the least, submit landing pages that redirect to my aff link? Any reason NOT to do so?
Each directory has its own policy, see what a few of them say. As far as landing pages, if the site has some sort of information or value, I'd say submit it. If it is only an obvious ad, probably not.
No, you should not submit affiliate links and i am sure 85% directories will reject your link and regarding landing page if it contains good content etc then yes submit it in directories.
Most directories are moderated by human editors, not bots. I doubt you will get any success. Try it and you might get yourself banned from the directory because some of them log IP and e-mail address.