"Mobile Workstation", or any other advertised name or usage or whatever they stamp on a product is only a title. It means nothing. Absolutely nothing. Naturally, it's up to consumers to do the research beforehand to figure out what they want to use a device for.
Having said that, the P51s sits a unique position, with almost no competitor or suitable category to fit in, which is probably what makes it sell. (That, and Lenovo's generous holiday sale that lowers the price to a meager US$1K)
For the msrp, hardware is ludicrous. Screen, audio and GPU selection of the P51s are poor. Performance of storage, the slowest component, is cut in half as PCIe only supports two lanes. And comparing with other 15" systems like the 15" LG Gram or Samsung Notebook 9, it's almost twice as heavy. Internals tell me Lenovo has made no effort to make them more compact or shrink the size of the machine in other ways.
As for the ports, they're beneath my standards. On a 15", I expect x4 USB-3-A ports, x1 TB3 with x4 lanes, and a lastest gen DP/miniDP as a minimum. This laptop uses HDMI and DP standards from 8 years ago, with only x2 lane TB3. Unbelievable. And I use both trackpoint and trackpad, for different tasks. My issue is with the latter, which is better than anything Lenovo's made before 2017, but still full of glaring bugs. To add to the issue, MS Precision allows hardly any customization, and there's been no decent third party software for trackpads in two decades of laptop history.
Keyboard is good, but not excellent or even great by business standards. Backlit keboards on Thinkpads have unusually smooth plastic finish, which makes it a nightmare to type with long nails. On top of that, there is a great deal of backlight bleed when trying to use the laptop from distance. Also, according to Laptopmag's T570 review, key travel has been reduced from 2.4 to 1.6mm. Yes, the keyboard is replaceable and a bit spill-proof and, but that doesn't further improve my typing experience. Which essentially makes it no better than 500$ budget laptops', and some of those even have complete waterproof.
Thermals and power consumption tell me Lenovo's tweaks obviously can't handle even a dual core processor load, and I suspect this is partially due to the new 25 watt TDP (despite what this review says, idk).
Now despite all the complaints, there are no other 15.6" laptops with this much battery life and durability. Those two items are my utmost priority, but so is the display. Personally, I prefer an FHD screen, but NBC's T570-FHD review informed me of its disappointing quality, so I'm very glad I didn't buy this laptop.