Hi Christian, I sympathize with that fear! It took me some time before I felt comfortable paddling in the Ultralight packrafts. The newer Ultralight fabric is very similar to the older fabric – to achieve the packraft’s very light weight we must use a very lightweight fabric or reduce the size and capabilities of the boat.
As a confidence building exercise, it might be a good idea to use some of your scrap ultralight fabric and a valve to make a small inflatable pillow (or even just use a piece of scrap fabric held in your hand) and then take it to the shore and scrape it over sticks and stones in the water to see how durable it is. It is not indestructible, but you may find that it is more durable than you expect.