Some people can't manage to work well enough when the music (Youtube or not) or TV (the commercials are a pain and they run on all channels more or less the same time) is on while the others use it all the time.
I have to use the TV or music all the time. I use cordless over-ear headphones. I have two of them; the other on TV and the other on the computer. I have a 3rd possibility also on my music device.
Most flats have many kinds of noise disturbances and if I would use only silicone hearing protection, I would hear low vibrating background noise and in the last two flats also a kind of a shower sound (plus the floors are often vibrating more or less).
Have to be careful of not getting hearing damage in the long run as that would cause noise that never stops. So, a subtle balance is needed.
Silicone for swimmers e.g.
https://www.quies.com/product/silico...lugs-swimmers/ Split them and stick inside the ears; can be washed.
The other reason is that the constant grind is one-sided and might drive one crazy.