I'm sorry to hear that the quality control of these headphones has gone downhill. I used the heck out of my first pair of Worktunes and they lasted about 5 years. I think they just got full of sweat and eventually something failed. I've had my second pair for about 2 years now and no problems.
I never had the radio headphones, so I don't know how loud they get compared to the Bluetooth headphones. I know that you have to crank up the Bluetooth device all the way up since there is no volume control on the headphones.
FWIW, I started wearing headphones and listening to my nursing lectures when I was outside working in the garden. Getting a little review studying done while working in the garden. It worked good for me and my gardening time doubled as study time!

I encourage everyone to wear hearing protection as much as possible. My dad needed hearing aids at my age, but I started wearing hearing protection as a young man and my hearing is still good now in my 60's.