I wouldn`t say my 6th and 7th trips were typical "bad trips" but I definitely did not enjoy them much. I did have tons of after images, colors, blobs, star bursting, ghosting, breathing, warping, and swaying during the trips that sticked with me. Thankfully all of that is to a minimum now and I don`t feel like I am still semi tripping anymore. I didn`t really want to trip the 7th time and I only did it because my friends and I planned to trip on that day. Towards the end of the trip I desparately just wanted to sleep it off and just go back to being sober. I think I had a turning point during that trip when it literally felt like something spilled in my brain and I knew something was wrong.
Yes people with full blown HPPD are a minority but I think most people who have done psychedelics experience some sort of lasting visual changes (at least very mild and rare). The only psychedelic I have ever tried was LSD. I have friends who have done ayuasca, dmt, LSD, LSA, and shrooms and don`t have full blown HPPD so it all depends! Yeah psychedelics can be interesting and fun but I don`t think they are the answer.