I actually want a good flip phone myself.
I bought a locally made KaiOS phone but it has too low RAM and keep crashing.
Nokia makes flip phones with KaiOS but they aren't allowed in my country sadly.
Reason is I want a phone I can repair myself, all my previous phones I had to replace because some unrepairable part that didn't need to be unrepairable (one of them it was the battery!) broke down.
Instead of shelling a ton of money to be tracked and buy a product that won't last, I wish I could spend my phone on something that will last.
And the flip cover is convenient for me because I keep forgetting to lock my phone and managed to pocket dial even with an android.