I've never seen a Blackstone until your post, had to do a Google Search. Looks like it folds up, but still looks kind of big to me. I can see where this would be a real treat to use, especially for larger gatherings.
We had 2 Coleman Propane Stoves, one was a 3 burner stove, the other was a flat griddle that also had one stove top burner. We used these for years, but really got tired of carrying the extra 20 pound propane tank and all the hoses to hook everything up. We eventually switched over to electric flat griddles (Presto), which we use almost exclusively for all our meal preparations when camping. (we always have electric hook up, we don't boondock).
If you already have the Blackstone, I think it would work pretty good if you had a family of more than 2 or 3, (maybe an over-kill for a just a husband-wife alone). But you also need to transport the propane tank. There have been numerous discussions on these forums over the years about to properly transport stand-alone propane tanks.
I do enjoy cooking on flat griddles. They are so versatile. We have a large lid that came off an electric skillet. The skillet is long gone, but we kept the lid. When cooking on the flat griddle, we use it to cover the food. It creates an oven effect, heats from all directions under the lid and keeps things moist as evaporation drips on the inside of the lid, drips down the the inside, and lands back on the griddle, causing natural steam. I recommend getting a large lid and cover those fried potatoes, those T-bone stakes, and those yummy ribs. The difference is amazing.
Good luck and happy camping!