Most of these coins I haven't even heard of - and yet large, popular communities like Monero still don't have support.
I think adding Monero (XMR) support would move forward the cryptocurrency community a lot more than any of these coins that are largely speculative.
The last time I checked they were actively working on adding Monero support. The roadblock is writing the code to sign the transactions on the device, because it's very different than other coins. "Shitcoins" can be added quickly and in large numbers mostly because they are simple derivations of existing coins that already have Ledger support.