No one who is older than 40 can suggest that weed is worse than it was years ago. Breeders have improved the quality, the strengths, the flavours, the yields, everything. Now they make it more accessible to even more people by making certain strains like autos's to suit certain niches who want something really quick (its not always commercial)
I am well over 40-years old and I not only can say what you said someone my age can't say, but I will. The pure landrace strains of the distant past were better than modern crossed strains. The biggest difference is in the olden days there was not the variety that can be found with crosses that will give you a bit of this and a bit of that all in one strain.
There is a lot of confusion about herb over the years. In the 60's and about half way through the 70's you could find tremendous pure strains that would knock your socks off, even though most of it had seeds. What gave many people the wrong impression of older strains is what followed soon after that.
Pure indica strains were bred with pure sativa strains by people who did not have a clue what they were doing. Average quality plummeted. If you did not know how to grow and did not have a good stash of pure beans you did not smoke quality herb. Later when better breeders became involved things again improved, but new smokers/growers incorrectly believed that the low grade herb they first knew of was the same as we smoked years or decades before. It wasn't though.
Another thing that helped perpetuate the myth is THC ratings in those days came from confiscated pot and the test results were averaged so the lesser grade herb naturally brought down the average. But the biggest thing that made older herb seem to be less potent than new 'modern' strains is in the past testing for THC percentages was done differently.
What became the test was what percentage of THC was found in all cannabinoids within tested trichome heads. In the past it was a percentage of all matter found within trichome heads. With everything inside a trichome head factored into the testing process THC would always end up being a lower percentage than if it were only a percentage of cannabinoids.
Of course the 'Dutch Masters' never bothered to tell the world that and instead kept their mouths shut so they would be seen as being Ganja Gods rather than the lucky recipients of the testing process being changed. Being seen as a Bud Buddha is much better for sales than being known to have gotten lucky.
I always have to chuckle when I hear or read where someone says how terrible Mexican strains have always been. Evidently they are unaware of the lineage of the very best strains today and how many of them relied on pure Mexican strains, strains that only later were destroyed when commercial growers who did not know what they were doing introduced indica strains into their pure sativa strains.
The same can be said for many other pure sativa strains of the past. They were amazing, but for some inexplicable reason most growers/tokers today need to believe that while they were used in modern crosses that the potency of the modern crosses came only, or mainly, due to the use of indica strains in the crosses. It is absurd for anyone to believe that the introduction of indica strains is the main or only reason that modern strains are potent, but very many growers/tokers of today do believe that too be true. Many old pure sativas, some being Mexican, had a mind bending high that no indica ever had.
Much of the credit for the modern strains that growers/tokers today love rightly has to be given to the strains that most growers/tokers of today like, and for some reason seem to need, to believe were garbage and no where near as good as modern strains, that it was only the combining of strains that created potency and that most of that potency came from indicas.
I am not saying that today's strains are garbage. I am only saying they are not really better than many pure strains of the past. What they really are is just different.