TP-Link still seems to me to be a fairly low-end manufacturer, and I don't think any amount of beta testing is going to change that.
You appear to have something against TP-Link or their products - a bad experience perhaps? However, you are adding no value to this thread.
All manufacturers hold external beta tests as they cannot test everything themselves - there are too many combinations of kit etc. out there in the wild. And even then, there are unexpected issues once a product is released - its a sign of commitment from a firm that they continue to support a product once its been released.
It has nothing to do with being a "low-end manufacturer" which is disputable anyway (a vfm manufacturer may be a better description) - just look at a CPE brand and find one that doesn't issue firmware updates - they all do. Sky, BT, Netgear, Asus, Zyxel, Billion, Draytek, Cisco etc..
Instead, TP-Link and others should be encouraged to open up their beta testing to those who have an interest in testing their products as TP-Link appear to be doing here.
If I can draw a parallel, I can understand why Kitz gets so frustrated about posting information she gathers about BT/Openreach Beta tests - and why Openreach decided not to be more open about their thinking (as they were once considering) due to pointless posts (from others but among similar lines disparaging their efforts)