Not entirely sure why I got downvoted. I guess people don't like HR teams.
A great HR team?
Showing up on your first day and having everything you need. A laptop that does what it needs, a pass, someone to induct you, materials that get you started. Making you feel welcome. Being productive and part of the team. Sure, your manager and team are part of that, but HR facilities this (In most cases, teams are woeful at doing this).
A great office environment. Making sure people have the right skills. And not just technical - managerial skills and support. Encouraging teams and cross-functional discussion.
Coaching hiring managers on the best ways to interview. Making sure people are greeted properly. Interviews are kept. Presenting an employee brand that makes people want to work at the company.
Having a performance review system that doesn't suck and gives people the feedback they need to get better. Sure, people hate then, but people also crave feedback.
An office environment that suits the culture and makes people productive. Making sure people are getting the emotional support they need.
Ever had a co-worker who's depressed, suicidal? Someone that has committed suicide. Or a death in the company? Someone that has a family tragedy? Organizing counseling for the team? HR steps up. It's easy to brush over these things until they happen. You appreciate a professional when it does.
Ever needed someone walked off the premises because they are threatening? Sexual harassment? Health and safety violations. Easy to say, meh, these aren't important – but, no, they are. Blocked fire exits kill people. Toxic cultures sink companies.
.. And yes. Making sure people get paid. That the health insurance works.
There are plenty of examples where this doesn't work. There are plenty of sucky implementations. Performance reviews generally suck. But I can assure that the growth tech companies wanting to kick goals are getting these things right.