For those complaining about dyneema's lack of stretch, do you have a problem with clipping in to hard points? That's a fallacy. The jackline is your anchor. If you want stretch it needs to come from the tether. Reduced jackline stretch also helps keep you on the small boat!
If you're concerned about it rolling under foot you can put webbing over it. I haven't had a problem with this as, a) dyneema flattens when you step on it, and b) I'm not doing a lot of upright walking on my little boat! Most of the time it's crawling or sitting! If I do stand there are plenty of other lines to watch out for anyway.
A BIG advantage of dyneema is UV resistance. I leave mine rigged all the time. If you had to bolt on the seatbelts in your car each time you went for a drive how often would you buckle up? Just for long trips? Only if the weather's bad? The truth is convenience impacts usage of safety devices more than we'd like to admit. The same goes for the comfort of the life vest. The only advantage of inflatables is people are more likely to wear them.