I, too, discovered this while researching Keychron models and options. I mean, what idiocy is that? Why have an illuminated keyboard if you still can’t read the keycaps in the dark??
Illuminated keys are the only reason I’m looking at Magic Keyboard alternatives, actually.
While I kind of agree, the material that the "Pro" keycaps are made of are a thicker, more durable material which produces a better sound and feel, which a lot of people who like custom-level mechanical keyboards are after. Producing shine-through keycaps in this PBT material is more expensive than the fully-built keyboard comes with (which is basically a $25 keycap set).
This is why Keychron sells the Q-series and K Pro-series as barebones kits, so you can buy separate key switches and keycaps to your liking. I'll also note that some of the better feeling keyswitches don't have translucent housings, which further diminishes the backlighting.
So, if strong backlighting is really important to you, you may want to consider the barebones kit and order switches you like that have transparent housings and get the keycap set you like.
Or forgo the K Pro/Q series and go with the standard K-series. Though you lose the ability to reprogram keys with VIA/QMK.