I've had the most success with propogation when I did it during the summer months. Don't know why, but it's something I've seen over and over. I've also never never ever lost a rose of any size when I pruned it after April when it was actively growing and all cool nights are over. I have lost roses from my early spring pruning, or even (trying to learn from that lesson) pruning around the time of the first flush. Again, I don't know why, I just know that I've killed a lot of roses through spring pruning. That being said, I wouldn't prune any small roses except for the reason you've listed: propogation.

I don't prune other than to remove a diseased or broken limb. Some people swear by pruning, but in our climate and with our heat, I like to have heavy foliage to protect the tomatoes from sunscald. I don't know anyone here in my county who prunes heavily or proactively, only reactively, and many people here are like me and raise huge numbers of plants so they'll have lots of tomatoes for canning. I know several families here who plant around 200 plants per year and don't prune any of them.

The Black Cherry, being indeterminate, can use some pruning early on in it's development. Later it'll become very tall and even more shoots appear, some out of reach without a ladder. By then it'll be fruiting heavily and you'll be picking rather than pruning anyway. It's my favorite cherry tomato, absolutely delicious. Best of luck.

The sun can cause sun scald(sun burn on tomato skin) in my area. I don't prune anything. I need all the foliage to provide shade for the tomatoes. Plus, the more suckers, the more blooms, the more blooms, means more tomatoes. The growing conditions in my area includes high humidity. Humidity interferes with blossom pollination. I maximize the number of blooms in an effort to compensate for the humidity. Your growing conditions need to be considered. Those who prune heavily usually have compelling reasons for doing so. Some zones have extremely long wet cool growing seasons. These growers seem to be challenged to keep their plants healthy the length of the season just to accomplish flower, fruit and ripen. Cooler climates take longer to do all three. Thinning the foliage by pruning is a strategy to increase air flow and reduce diseases that that threaten the plant, up to the point of preventing any harvest at all. I am not an expert, still learning.