A fallacy created by PSA and the TPG Gods, and widely accepted by their sheeple... they want to scare you into thinking they provide a vital service.
If you like the way they look in screw-downs, then use them. As long as you don't force the screws unreasonably tight, the card will be well protected.
I have sold/traded cards that were in screwdowns for over 20 years, and all came out fine. Many of the cards' new owners felt the need to submit to TPG, and all have received the exact numerical grades that you'd expect.
Do what you like and don't buy into the self-serving agenda.
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