I wonder how much time Japanese domestic travelers (leisure vs business) spend at ITM before boarding and if this will impede the entrance flow? I imagine putting an entire section of shopping like this directly in the entrance path of a major Shinkansen stop would slow down their throughput and people would get frustrated trying to dodge the shoppers.

Outgoing business travelers at Itami probably appreciate the proximity, transit options, and more efficient security-> gate. I would guess the other style of European Schengen airport shopping with order before outbound flight, pickup at arrivals would work if they offer decent deals on similar items (Alcohol, tobacco, perfume, small luxury goods).

OTOH, CTS has a lot of attached shopping and amenities which does pretty well with the leisure market, especially since there is also a healthy rental car supply for people who prefer to drive themselves and ski shuttles who still need to purchase omiyage, personal souvenirs, and meibetsu. I imagine this kind of setup would be quite profitable in OKA, too. I don't know why some of Japan's domestic LCC terminals hadn't adopted this prior to COVID-19 shutting down most international tourism, other than leisure LCC passengers trying to avoid luggage fees with carry-ons & not having any more onboard bag allowances.