I can't use the App in the OP since it's for M1 only and I have an Intel Mac. But I appreciate the pointer to DiffusionBee! Also, this is the first time I've seen the author's website - and he has some nice apps available! Definitely going to play with some of these.
This author has very high opinions on what he thinks a better UI is. He has some other app, where he sells his application better because it has better UI than mine.