I don’t feel like the fluoroelastomer “softens” with time, but I also don’t find the bands to be particularly hard/inflexible, either.
For me personally, the Solo Loops and Braided Solo Loops are definitely the most comfortable bands, but I don’t think the Sport Bands are UNcomfortable.
…that being said, I am also not a fan of the Sport Loops (for both comfort AND aesthetics) end other people seem to love them, so… YMMV. 🤷🏻♀️ Do what works for you, my dude. 😎