It's not cheap enough. Also doesn't have enough headphone jacks. Though, I think more phones should use Thunderbolt — and more phone users should understand that Thunderbolt is not an Apple protocol, but an Intel one, Apple's just the one most known for using it, since they slap it on everything, because it's awesome.
Give me a phone with Thunderbolt 5 and I won't complain about the headphone jack or an SD card slot, because then you're going to see phone docks with USB, Ethernet, SD/microSD, HDMI/DisplayPort, internal M.2 SSD, etc, most of which won't be necessary, but imagine if your phone could just be your computer and plug into a dock. We have the technology but no one puts it on phones. Samsung is close with Dex, but it's not very good and it isn't automatic (and their ports lack the bandwidth). With as much as phones are going up, it should be a given that they could double as computers.