dafyomi2711:- You made an important point too.
Another Halocho about Kaddish which is virtually unknown is the original Takonno, that Kaddish is to only be recited by 1 individual at a time. Having multiple people recite Kaddish at a time is only a concession, and leads to numerous Halachic issues, most significantly that when the reciters don’t remain in unison, it becomes 1 big jumble, and if some of them are not responded to or don’t have 10 people hearing them, are not even Yotze Kaddsih at all.