is that they are Not as Strong and Durable as same type parts made by Molding or Machining.
And I doubt 3D technology will ever advance to the Same Durability level.
I disagree completely with that.
If you configure the print properly parts should be more durable and stronger while also being lighter.

The ability to alter the interior density and configuration of the interior of an object make things more durable than solid parts.
Solid parts will shatter because shockwaves propagate quickly through solid medium.
The same part made with a non-solid interior and strong skin, will not shatter as shockwaves do not propagate well through voids.
Also a non-solid part will have better flex.

Also the sheer variety and strength of available fff filaments - from super strong nylons to incredibly tough flexible materials means that you can more easiily tailor the material and print settings to an object.

If you print it correctly and understand how changing layers and infill changes the final objects properties - then you should be producing parts every bit as strong - and in most cases, more durable - than injection moulded parts.

If you can't use a machine properly - don't blame the machine.