Picking out an office and furnishing it also sucks, but at least you might do particularly well on it.
Although one quibble I had with it was that they gave us a standard policy handbook to have signed by employees which was ridiculous and out of touch with the realities of tech startup (ie employees shouldn't use their work computer to send personal emails, etc). We sent it back to them and they were accommodating.
(Algentis is the one we're using)
(I'm talking things like having a raise agreed in writing, and then getting paid significantly less. And, when questioned about it, the owners saying "oops, yeah, should have told you, we decided we can't pay you that")
Presumably such a entity should also provide centralized arrangement of benefits, payroll, legal documents and other issues. An extreme form would be to have this management company run resource companies that make all hires on pass-through basis and submit a single consolidated bill to the main company each month.
Why wouldn't this work? I can think of only three reasons though I'm not convinced any of them are true: Insufficient supply of sufficiently homogenous companies (e.g. software startups); sufficient diversity of preferences for customization, particularly with regard to location to create insufficient density; or fear of poaching due to close proximity to other companies that require the same skillset
What my dream office is is a standalone building, light industrial style, in Mountain View, Palo Alto, or Menlo Park, with gated parking, and ideally a mile or less from public transit. Onsite generator, fiber, etc., and a way to split the building into public event space for 100 or so people, and offices, with private offices for everyone, with courtyard-type spaces for the groups of offices. 300-500 square feet per person in the "office" area.
The smaller buildings on Plymouth in MV, or Pioneer Way, or some of the office parks in Menlo, would all be fine.
I doubt most other startups want this -- they all want shared spaces with big open plan offices in nice buildings in downtown SF, it seems.
You mention that by Series A, companies want to customize. Is it more a function of wanting some of their own common space or a desire for individual expression?
At least in silicon valley, the annoyances still exist but don't rise to the level of huge opportunity to fix, since the current solutions solve them pretty well, and the pain-per-customer is finite (you only really set up payroll once, etc.)
It's just annoying. The real pain points remain 1) finding great people and hiring them 2) managing teams 3) product 4) customers 5) funding. Office space is the only minor issue which ever rises to the point of serious, and it's only exceptionally bad if you're looking in Palo Alto (SF and even MV are fairly ok). Admin overhead isn't on the list.
(unless you really want to solve it, but there are a lot of reasons why startups aren't great customers. Only really in the Bay Area and maybe NYC is there high enough density to come up with something, and since most of this is regulated per-state (and per-city in NYC and SF), you'd probably want it to be locally focused.)