This outcome is expected, this is what makes most altcoins dangerous for long term hold without looking back, they can change from a Chain to another, they can swap smart contract, they can do lots of other things and if you aren't following you will lose out, it's always good to stay active
I appreciate both coins with proper blockchain and wallet clients and coins that using already existing blockchains and ecosystems. But the main point is as long as you have the wallet.dat file, your coin stays with you forever without any daily checking or mishaps that need to swap and such. While the same can't be said for coins that utilize token ecosystems.