Both statements can be correct at the same time, and I suspect this is the case.
Generally speaking a simpler explanation is more likely to be true.
In other words modern production techniques are probably better suited to semi-autos than revolvers, rather than their also being some fiendish plot to intentionally sacrifice quality on revolvers as they are no longer used in law enforcement.
On the one hand, the vast majority of pistols (by make, model or just plain numbers and percentages) are also not used by law enforcement.
There are between 600,000 and 700,000 law enforcement officers in the US in any given year. The number of new officers issued or existing officers re-issued a handgun is a lot less. If the average LEO stays in law enforcement 7 years and each officer is issued a new service pistol, that's only 100,000 pistols per year.
Since there are about 4.5 million pistols made in the US each year (compared to about 850,000 revolvers. The odds of a pistol being used in law enforcement are still only about 45 to 1.
On the other hand, Modern MIM and CNC processes mean that reliable pistols can be made without significant hand fitting. The 1911 is a great example, as you can now get a reliable 1911 from various manufacturers using low skilled labor that are quite reliable. That was not the case in the past, where a high level of precision machining and hand fitting by actual humans was required.
I'll argue the same is not the case for a double action revolver, where hand fitting is still essential. I refuse to buy a current/recent production Ruger double action revolver based on 2 out of the last 3 I bought being improperly fitted with 1 of the 2 being returned to me twice, before they replaced it (all over an improperly cut forcing cone).