Everyone is entitled to an opinion, but I think with low-hour PPLs in particular any recommendation that the checklist be:
ditched out the window just like 'stall speeds', once the pilot has sufficient ability to think about what they are doing rather than doing it by rote
is less than helpful.
Many PPLs fly on an irregular basis. It is not so much to do with 'sufficient ability' but 'sufficient experience'.
The old maxim of checklists on the ground and mnemonics in the air still holds good.
Try passing a flight test, whether private or commercial, without the use of a checklist and I'll guarantee you'd fail.
Surely that is the touchstone, not a view that because of brains and experience you are above it all.
Remember you're never too old or too experienced to have an accident.
Not using checklists can only serve to reduce safety rather than enhance it.