They're already a decade behind where they could've been. The main problem is not that it won't take them long to start, but that it's been so damn long already and they've wasted all that time and haven't even started in earnest yet. Market share takes time to earn and they've given competitors a huge lead for no real reason at all beyond their absurd fixation on hydrogen.
The fuel cell can't produce electricity fast enough to power the engines for proper acceleration and the battery doesn't have enough buffer.
FCEVs are chemical in the same sense that BEVs are, because a “fuel cell” is, like a battery cell, an electrochemical cell.
The only real difference is that the “fuel” and “waste” are inside a battery, but come from and go to the outside in a fuel cell, which means that an FCEV can be fueled (and exhausts) like an combustion engine vehcile, despite being fully electric.
So are batteries too