haha - then you do not use PowerMOSFETs.
The decision for 5V is not made by me as a fashion choice; as a designer I use the technology best suited to the task.

For directly driving power Mosfets (without wasteful pull up resistors and Multiple supplies), then a 5V part is the cleanest solution.

This used to be put in the 'too hard' box by chip designers, but a combination of customer demand, and more skill at mixing Analog & Digital, means many vendors now include the voltage regulators.

This makes perfect sense : My system design does not care what core voltage they choose, and I get to directly drive power FETS, with clean edges and low power. - and Analog IPs have wider dynamic range, and better noise tolerance.

Everyone wins.

There really is no excuse now for NOT supplying a Wide Vcc part.
Vendors want the widest possible available market, so they are doing this, in increasing numbers.

Besides the new Nuvoton chips in my example, Atmel have a wide Vcc AT32UC, and 5V ARMs are becoming MORE common, not less.

SiLabs newest Automotive parts, are all 5V operation, as is the PSoC from Cypress.

Freescale's newest wide Vcc small parts are quite impressive: they have buried regulators with no external decoupling pins.

So stick with a 3V3 ceiling if you want, I'll remain free to choose 3.3 OR 5V, depending on what best suits my design.