You can actually ignored those child boards so it won't show again when you visiting this board.
But yes, you are right, those child boards are so old and need to be replaced, there are lots of open source wallet with lots of community e.g. Sparrow and blue wallet, that are excusively for bitcoin just like electrum.
I think sparrow is the only wallet I can think of that would deserve a place in this sub.
But it is so new, it was released just 2 years ago. I would wait the test of time before adding it. (lots of wallet fails over time)