Those are all good questions and very timely. I was just thinking about proliferations because here it is that time of year. I harvested three already, all of them by accident. I was pulling dead scapes to check the height, branching and bud count and accidently pulled a scape from 'Victorian Princess that had two proliferations', then today I was doing the same for 'Peacock Maiden' and pulled a scape with a proliferation on it.
I never consider proliferations when buying a plant, there is just not enough info that I have found to make it worth trying to research a plant for prolifs.
I do have some plants that make a ton of proliferations and multiply fans fairly fast also. Some of my NOIDs make so many prolifs I have learned to just ignore them. Even on the plants that multiply fairly rapidly I still often like to harvest a proliferation because it is so easy and potted up it make a great gift plant.
I can't answer any of the seedling related questions, but I would love to hear from some people who have experience with them.
I have been told that there is very little if any stress put on a plant when growing proliferations, I don't have any scientific studies to back that up.
This plant makes lots of prolifs every year, it is a NOID of course.
Here are the two from 'Victorian Princess' I just planted (pushed down in the mud).
Oh, I have a question to that occured to me today: should you cut back the foliage on prolifs.? I never have and they have done fine, but it just seems with such a small developing root system (if any roots at all) it would help the plant get established.
Edited: I just noticed that I actually did trim back the foliage on one of the prolifs, maybe subconsciously I knew I should.