The point is to have the ability to use a force push against every single enemy in literally every single situation except the specific one that you showed.
You can still safely force push everything except bursters, when using kinetic flayer.
When not using kinetic flayer, you can safely force push everything including bursters.
It is one specific talent, that makes it risky to use the push attack against one specific enemy. According to you, this specific interaction makes the force push pointless in its entirety in general.
Do you have the same complaint about other things?
Smite can trigger the talent, so you can not mindlessly smite bursters that are nearby, when running it, since you might pop them.
You can not safely knock over a burster with the flame staff primary attack, when running that talent either. Again, because the burster might get popped.
Same thing with any other attack. Without the talent, you can often land an accidental hit, without killing a burster.
Should all attacks no longer trigger kinetic flayer?
Should flayer never trigger on bursters?
Where do you draw the line?