Damir the connectors for the older lighting port are bad, and I mean the generic ones, even the original ones can’t be trusted for long especially with those prices.
On the USB C port adapters I have not seen yet a bad one, if there is one it’s a fluke. I’ve gotten a few and all work well. I don’t need a headphone jack adapter but I just ordered one just for fun.
You can hang on to your legacy toys and it’s fine.
I’ve moved on.
I’ve even gotten an M2 iPad and M3Pro MacBook Pro. Life is better faster and lighter.
Everything connects better and without issues.
Next will be at some point a newer iPhone with USB C as well, I’m still on the 13pro.
At some point you’ll have no choice but to move to new tech, you already have one, learn to use it and you’ll have less stress.
Or not 😊