If you are frequently opening boxes, that spring-loaded mechanism is going to cause repetitive stress injuries. No competent workplace health and safety employee would approve it.

Also, if you are using a utility knife frequently, you likely have a depth you want to keep it. Say I’m installing carpeting. I want to set the razor at a depth for the shag of carpet I’m working on today and have my blade at that depth until I’m done. With a spring load, the only depth that can easily be set is fully out where I’m pushing it all the way. Any intermediate depths will result in me shaking back and forth trying to hold a constant intermediate pressure.

This is a utility knife for someone rich who uses it for the day’s amazons packages because they think using the blade from their scissors is beneath them.

Other people have linked serious box cutters for "I need to use a box cutter on 100 boxes" cases, and OLFA's small box cutter will work well for a bunch of other stuff (OLFA also has like 20 other form factors all at reasonable prices).

I have several Stanley type box cutters and blade retraction is an infuriating experience on each one because it gets stuck, the lock button gets stuck, it doesn't slide properly, often doesn't click into place, etc. I can definitely see the appeal of an object that is actually designed to work properly.