It shifts the entire range in 3 seconds using the 3 gear shift shortcut. But only a subset of the gears will be necessary to get up to speed as it has a 560% gear range. I doubt you'd need to go through all of those very often.
I agree with you about the custom sequences. If you're stopping at a red light on a flat terrain, you might only need to jump down into 2nd or 3rd gear. But if you're starting off on a hill, you'd most probably want to start in first gear.
I'm excited about the system because it integrates drive and transmission, which will probably get other IGH manufacturers to rethink their current products and takes things a step or two further. The E-14 is eagerly awaited by professional users in the cargo e-bike segment, and it will no doubt trickle into high end recreational e-bikes too. I expect the price tag to be fairly consequent, but it's a proof of concept type of product, which is probably why Bosch has embraced the association with Rolhoff. The idea here seems to be to encourage other manufacturers to adopt e-shift.