I have one of the slightly older 7-series HP Omens, and actually it's a really decent laptop for the money I paid, with a few caveats. They did use to have 1070 and 1080 variants so I'm sure they do still somewhere, unless they've cleared inventory to prep for 2XXX series laptops. The Omen 17/Omen X at least also tend to use non-MaxQ, so for example, my non-MaxQ 1060 isnt as far behind a MaxQ 1070 as you'd think (~25-30%) whilst being much cheaper, and certainly plays everything I've thrown at it pretty well!
The downside of the 17" laptop:
-Despite being 17.3" only has room for 1HDD and 1 NVME, ODD cavity could theoretically be used, however no brackets/cable included unless you bought with, and additionally I believe they limit the speeds of that connector
- HP are conservative on power limits for the GPU due to the the chips being integrated not MXM or similar. The 2 1060 machines I have access to get power limited before they can hit the 1900-2100 MHz consistant speeds some Clevos and other machines can with tinkering and tend to vary between 1600-1800 most of the time even when overclocked, dependant on power load
- BIOS is VERY locked down for an enthusiast gaming laptop, this even makes initial resetup of the machine to run off an NVME drive a little bit of a pain as you have to jump through a few more hoops than you'd expect.
- The 120HZ screen I have whilst IPS unfortunately doesnt have the best response times, but I've adjusted. The 144Hz variant is meant to be miles better.
All this being said, overall I've been pleasantly surprised by my HP Omen 17, best gaming laptop I've used in general stability, reasonable temps etc, and much as I wish I had an 8 series CPU with the higher clock speeds, cores and threads (or Ryzen if it put me in a better position), for the money I've paid for the machine and upgrades a year ago now, I can't really complain.
Also HP tend to support Thunderbolt 3/eGPU, and even have thier own dock, although I suspect they're refreshing it at the moment as I can't find it in stock very easily right now. As I have a 1060 though, realistically no point for me to even consider it with the hit eGPU has to performance though, I'd need something 2080/2080TI level to really benefit.