(1) Not trying to start anything, but why not keep your clean record brushes in a sealed container? Away from environmental nasties?
(2) And I'd have to agree 100% with your dust cover comment. I can't imagine anyone using one while playing an LP.
(1) I can't disagree with you. But in my basement audio den, 10ft sub-grade with basement door upstair closed at all time, being temperature constant (19C) & almost dust free, I don't see I need any tight-sealed containers like Cupperwares.
I check up to make sure the stylus is clean each time before any vinyl music session with magnetifier lens, & high-density LED light.
(2) You may be surprised so many many vinyl fans still play their vinyls with TT lid closed to shield off dust while spinning. But they don't see the danger of lid vibration intermodulation.
My vintage Thorens 125II, still kicking around like a teen, came with its stock HINGED lid. I modified it so that I can take it OFF when the TT is spinning.
"If facts do not fit the theory, change the facts" quoted Albert Einstein.