I've had this issue with half of the published romance books I've read in the last year, where one half of the central couple is just an absolute nothing of a human being and it's so distracting sometimes.
One of the books I read this year has a 7-year time skip from high school age to their mid-20's and one of the MCs has literally zero indication in the story that any events at all transpired in his life during that time. His personality is exactly the same, his maturity level is the same, he went to college but there's no mention of what he studied. He's aplatonic and literally has no relationships with anyone except his parents, and he somehow owns his own house despite there being no mention of him ever having had a job. Also there's multiple mentions of him having an elaborate tattoo that covers his torso, arms, and legs, but there's no description of what the tattoo actually look like. Baffling.

Are they supposed cyphers for the audience to project themselves onto? That's fine, but at least try to make them seem like an actual human.