Why don't CPUs and microcontrollers operate on 24v?

In 2 years I migrated from 12v cmos techology, to briefly 5v logic, and now it seems 3v3 for the GPS / transceiver type modules available.

I think that the 24v , or 5 volts can flash over between tracks in the chip, with the spacings they need to use , so 3v3 works with the micron spacing for these chips.