If Garmin can figure out the battery hurdle with having the Pulse Ox, they’ll put it in the next generation of Fenix (6?) watches. Then the 6x will have a special sensor (maybe blood pressure or an ECG) that trumps the 6s and 6.
Blood pressure on the wrist is useless. Electronic BP devices are prone to errors. The smaller the get, the worse it gets. The Samsung watch will result in a lot of unnecessary emergency calls. If you move the device while measuring, for example while driving over cobblestone, each bump will result in a input and it will read far higher pressures than necessary. The only result it can give to you: you are alive.