This simply is not true, there is a difference in quality of material from different manufacturers.
All shingle manufacturers use asphalt (except Malarkey) this is true but it is not the same quality or formulation this differs among manufacturers.
Some manufacturers use a higher metal content in their granules which help to combat moss and algae growth and streaking.
If you were around in the 90’s you are well aware that the quality and composition of the mat on which the shingle is built is critical to the long term performance of an asphalt shingle.
The quality and composition of the mat varies from one manufacturer to the next.
Even something as simple as the sealing strip can cause a shingle to fail, if it’s too strong the shingles will rip over time if it is not strong enough the shingle may blow off.
The packaging has an effect on the final product also, with the advent of plastic wrappers there are many more damaged corners from mishandling and the plastic wrapper retain water so in cold climates everything freezes together.
There is a lot more engineering & technology involved in designing & manufacturing an asphalt shingle than many fully realize and to say that they are all the same is just plain ignorance.