tampons -especially if already absorbed some blood and fluids- tend to dislocate or come out when pushing. i’ve been using a menstrual cup for the past decade and find it easier too but even with the vacuum, sometimes it might dislocate a little if one has to push a lot, especially if the cup has been inserted recently so it didn’t have time to settle in, and just because it worked for us it doesn’t mean menstrual cups are accessible, or comfortable, or ideal for someone else. OP was just ranting about something that annoyed them.