I didn't know too much about hardware wallets, so I was surprised to see that these past forks have been supported by Ledger.
Quoting
Ledger's CTO on the matter:
"We can easily support forks that have a price and are legit. I don't believe [
Super Bitcoin][...] is, but that's just my opinion"
Both BTG and BCH run with the same chrome application as the Bitcoin app does,
the changes are considerably small for most forks.
IIRC syncing the BTG node took them more time after the fork than getting the code and app ready.