Not really.
AFAIH, PCB mounted switches are even pricier than normal plate mounted switch. As PCB mounting doesn't have the steel plate to support the position of switches, the switches had to come with 2 extra pins/legs (plastic pins) to ensure the switches being mounted onto it firmly.
PCB mounting also means easier to disassemble the switches (good for modder) and lighter overall weight of the keyboard (which is good for smaller travel keyboards).
Lastly, even the typing feels also had quite a significant differences. Plate mounted switches will feel more solid and hard while PCB mounted will feel more soft and elastic/flexible when bottom up the switches.
Of course, I don't deny that PCB mounting may cause a board to be "flexible" and less solid (I feel you with my Cherry MX 2.0 Board), but also thanks to that board, I realize that some switches (RED for me) actually feel better on PCB mounted boards.
BTW, PCB mounted yet solid and not much flexing boards do exist (Cherry 3000 series and PLUM96 are nice examples).
yeah the plum mx 96 is nice.