Buy a yoghurt maker. You add milk, 5% of already existing yoghurt and whole fruit (berries are best). Leave overnight and now you have yoghurt with fruit and no added sugar. The fruits are whole so they have fiber and any natural sugar in them isnt going straight to your blood now.
If a security flaw is discovered and patched, it is a good sign the manufacturer is standing by their product and providing support. AFAIK, tp link does push regular fw updates for their omada gear. I’ve had two in the last month.
In your case, I’d open a support ticket with that issue and see what tp link thinks directly. If you don’t like their reply or are ignored, you will have your answer on whether or not you should switch.