My comment wasn't saying that HR wasn't important or that their job was easy, it's saying that it doesn't require skills which are hard to acquire in the labor market. If we use credentials as a corollary for skills (which, ironically, is understating my case), then there are a vastly higher number of available persons in the labor market with the necessary credentials/skills to be in an HR role than to be in a technical knowledge worker role like software development, operations, or even product management.
The pay differential between these roles is mainly a factor of supply and demand, not necessarily due to the relative difficulty of actually doing the jobs. Most jobs which are "social" rather than "technical" are actually harder in some way, but they have as massively lower barrier of entry from a credentials/skills perspective so tend to be significantly lower paid than "technical" jobs.
Digging ditches is a lot harder than writing code all day in an air-conditioned office, yet ditch diggers who aren't credentialed machine operators get paid significantly less than software developers because the only qualification barrier to be a ditch digger is to not be physically disabled or unalive, if you can fog a mirror and walk from the truck to the hole to be dug and operate a hand shovel, you can dig a ditch.
Supply/demand doesn't care how difficult your job is, it only cares how many people are capable of doing it compared to the number of people needed to perform it. In a very dollars and cents sort of way, the time of a technically skilled person is more valuable than the time of an HR person, which is why it's very rich that they think you're wasting /their/ time, rather than the other way around in these situations. The candidate's time is actually more valuable in demand dollars than the HR person's time, especially recruiters which are one of the lowest barrier roles you can have in HR.