We don't know what exactly happens sia is a very old coin and why the coin is not supported for different Ledger wallets. There are many new other coins which are being supported in different ledger wallets and why sia is not in those lists.
I actually was just recently noticing this which is weird. Siacoin is a very old coin which had some great success on exchanges early on. Wondering what happened this coin actually made me some good money trading
Sia is supported on the Ledger. It is not user friendly yet, but possible as outlined in these instructions now:
https://support.sia.tech/article/1tteqxvgh0-sia-ledgerlike you say it's not user friendly. i think that would be better that ppl see the sia app in the ledger manager... but it seem that sia team is not interested in that. seem that the project is slowly dying and focusing on minning hardware... but maybe i'm wrong. what i see it's that smart money seems gone away... maybe some accumulation but i don't know... was listed in kraken so i hope that under the scene something is going to happen...
after several years we cannot build a website. just put some files in a "decentralized storage"... no video streaming nothing that could bring ppl or company to use it... sia is doing worsltly what an ftp can do... 2 years dump... i keep some coin on binance... but i'm skeptic regard the future of the project