I would add segwit. Which virtually increased block size and was not implemented in bcash and other forks.
It is somehow a on chain scale. So now we have on chain and off chain scale solutions, with lighting network
SegWit falls under the first group (main scaling should occur on second layer and the first layer should scale without hard fork), otherwise you are right that SegWit also offers an on-chain scaling by increasing the block size but it is through the soft-fork as I said in the first category which makes it a limited scaling.It is somehow a on chain scale. So now we have on chain and off chain scale solutions, with lighting network
It's a bit off-topic but bcash has implemented more of SegWit than you know. From the SegWit way of transaction serialization for sighash all the way to the bech32 address format.
