Honestly I don't see much of a problem if this is applied to imports of single items by an end user. I used to be that I had trouble importing some device partly because the power supply was not certified by the local regulatory entities. Most of what people import in single quantities are electronics with switch mode power supplies that work from 100-240v and at 50/60hz. I doubt many people are importing a hairdryer or a toaster. Personally if a power supply is approved by the FCC or some other important entity I consider it good enough for my personal use, even if it has a foreign plug.
It is a problem for importing large quantities to resell though, I'm not defending the ability to import 100s of death traps and sell them to people.
As I understand it, the most frequent type of importation by item is wholesale, we can be talking about the import of 500k phone chargers.
I think plug types are not a great risk as users will usually not want that. But in my head the risk is that we import 500k of something that technically works, but is off spec by 10V or 10hz, or the tolerance specs are too wide or too small. It's obvious how too small of a tolerance can cause issues, but too wide isn't ideal either, as there's tradeoffs, you end up importing swiss knife products. Which makes sense for big expensive electronics, but stuff like phone chargers? Subterranean or aerial cabling?
The task of verifying the quality of something is distinct from the task of verifying that it conforms to the local standards. And I wouldn't put it past the cargo culting governments to figure that if it's good enough for the US it's good enough for us.
"There's too much bureocracy in customs for electrical imports, make it laxer, also no restriction on plug types