Install linux somewhere, ssh to it and set up a web sever and an ftp server. Access it locally and then access it from the internet. This should be your first goal. It will make you comfortable with the command line and linux. You can try a montero node then.
ChatGPT will be able to help with the basic stuff like how to check logs, configs, or what SSH is or how to set it up.
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.