Yes, of course, the word intentional is common parlance in describing some foul shots in pool games. My point was that the rules do not try to distinguish between an intentional foul and an unintentional foul, they just address what is required for a legal shot (where "shot" has a specific definition). If the requirements are not met, it is a foul, whether done intentionally or unintentionally.
And, to repeat -- no, you do not have to contact an object ball when intentionally taking a foul. That is done quite often in 14.1 games.
But the general subject of trying to foul intentionally in close quarters has long been a subject of discussion, and my post #6 addressed what is required. Here's a thread from 2009 that discussed this issue (starting with post #30):
https://forums.azbilliards.com/threads/rules-question.156475/