Being a separate platform ultimately hurt the PSV.
While it legitimately works as a satellite portable for the PS4, it's not 100% compatible mainly due to the control layout (two additional shoulder buttons plus two extra analog stick buttons) even though the back touch panel should have been able to mitigate the lack of physical additional buttons.
It's a bit pointless to compare the Switch with the Vita due to the passage of time.
As advanced as the Vita was for its time, SoC tech has grown at a far greater rate than traditional CPU/GPU hardware set ups, meaning the Switch sees the benefits of the accelerated jump in portable based tech. By comparison, the Vita was more portable PS2 than portable PS3.
The Vita was designed as a portable unit; SCE released a TV unit that was effectively the home based dongle in the effort to expand the user base for Vita games, but unsuccessfully.
The Switch was designed from the get go as a two in one solution that looks pretty elegantly executed even at the cost of being more like a tablet than a gaming PC. It's the Nvidia Shield to the Nvidia based gaming PC. Now Nintendo won't be splitting development resources across two separate platforms unlike the Vita, which was ultimately shortchanged due to never having hit critical mass with 3rd party developers.







