It’s worth checking the pre order picture before drawing that conclusion. Blush and Citrus 512GB models sold out before launch day even arrived. Delivery dates for pre orders slipped to late March not because Apple under supplied, but because demand absorbed the initial allocation faster than expected. The walk in stock available today exists because that demand was front loaded, not because it was absent.
The M5 Pro and Max comparison actually reinforces the point rather than challenging it. Those are also available for same day pickup because at $2,000 plus, the pool of people who can walk in and buy one on launch day is relatively small. The Neo is priced for the largest addressable market of any Mac Apple has ever made. Managing same day availability at that price point and that scale isn't a sign of weak demand. It's a supply chain achievement.
The person who judges product significance by launch day scarcity is the person Apple has always sold to. The Neo is for everyone else.