I see how it isn't such a whopping security issue, but storing your PK's in plaintext is still wrong. They should apply some kind of encryption there :/.

I use the Bitcoin.com wallet. It's great in its simplicity, but it's not perfect. The good news is that it's updated regularly.

Edit: Yeah, I see now that it's even less of a problem than I thought.

https://www.reddit.com/r/btc/comments/814equ/vulneribility_bitcoincom_wallet_stores_mnemonic/dv16wo3/