None of the GMK group buys I have seen in the last few months (Hyperfuse, TA, Miami Nights, Olivetti, Red Alert, Classic Beige, Electric Bluegaloo) have bothered including the padlock symbol caps lock.
Many of these group buys have included a R3 Control key though, suggesting that the lack of inclusion does not have to do with trying to keep the number of keys low. This makes me wonder why the 'pad lock caps lock' is so often excluded?
Is it to do with having consistent icons or text for the modifier keys?
I personally really like the look the padlock key and wish it was included more.