I will give my synthetic fibre brush some second chances, before wasting it. Tried it now the second time. I mean, yes, you can basically use it, but it's not fun with it's too much backbone. So lets see, if it will be soften a little the next five times. If not, then garbage can. It's just a 15 bucks-brush from "nom" by Mühle.
It won't change. I have an old Kent synthetic that I carried in a toiletry bag on 2-3 trips a month for years, and it looks like it just came out of the box new. Talk about backbone with this one! It gives a soft scrub on the face.
By the way, when I replied before I was talking about the feel of the bristle tips on the skin. The overall stiffness, or backbone, is something else. I have a couple synthetics that are soft to the feel, but with very much backbone. I also have synthetics with little backbone like a floppy badger.
To me, the Simpson Trafalgar is a synthetic that is very soft on the skin with just the right amount of backbone, and the price is great. But there are many choices for inexpensive quality synthetic shaving brushes nowadays.