Earlier quoted context omitted.
What "many people" don't like about this system is just how effective it is at regulating their businesses. The alternative - that the 535 members of Congress should regulate every detail of every facet of federal life - is completely untenable. The reality is that Congress has been effectively neutralized as a law making institution for at least two decades, barely able to do more than pass the budget and one or two…
Said differently, most people don't care about principles. The government is designed based on certain principles that define how it is meant to work, and there's a reasonable case to be made that the executive branch should not have the authority to functionally create laws or run their own courts. That just doesn't matter to most people, as you said they're happy if those regulations work for them. The same situati…
But that is not what is happening here. A principle is not self-motivatingly good just because it exists. The principle that Congress must directly make every law and set every detail of that law is simply a bad principle, at least for a country of the size and complexity of the USA, and given the last 200 years of experience in good and bad governance.
Congress has long understood this, and so they have invested some of their legislative power into various executive agencies, while still maintaining a great degree of control over the broad strokes of what those agencies do.
It's not useful to anyone for Congress to, say, debate and set the exact safe level of every chemical known to man in water that should be enforced: the EPA exists to study this and take the right measures based on the most reasonable scientific knowledge of the day. If the CDC discovers that exposure to teflon above 1 part in 100,000 is likely to cause significant harm, it shouldn't be regulated only once Congress meets in the next session.