It's still new. Everyone has their own protocols. Because they're different technologies, you can store your tokens from one in another's wallet. It's like trying to plug a micro-USB charger into an iPhone. It doesn't work. Eventually, hopefully they'll all switch to the crypto-equivalent of micro-USB so you can use one charger for anything. Although, that would decrease profitability for Apple. Or it would make it so you could easily get out of the lower-quality cryptos, so maybe they wouldn't want that.
There are probably other issues at work and I'm not claiming to be an expert on it. I have heard there are some solutions that allow you to hold multiple currencies in one spot, but I haven't used them. I'm still running the separate wallet deal. It's super fun to keep track of all those passwords. The joke is on them, I use the same password for all of them. abcdefghijklmnopqrstuvwxyz1234567890. No one will see that coming. ;) LOL
Bitcoin is backed up. It's a thing that has been a thing for quite a while. Transactions take a long time.