You somehow expect multiple people in (hopefully) multiple departments to spontaneously self-organise into a rube goldberg machine that gets the product marketed, sold, billed, paid for, supported…
Disproof
Some documents detailing what happens when integration tests succeed
Consequences
In addition to the usual consequences (you die), it also has a wonderful mid-term effect of destroying goodwill across the company as one team inevitably pays for another team's fuckups
Or, some teams might actually try to spontaneously self-organise in response to pain
The problem is that like neurons, teams that fire together wire together and this might not be the best thing
Evolution may cobble together something that works but lord will it be inefficient and have nasty externalities
Be inefficient enough and someone else eats your lunch
Causes
Usually results when the founding team could handle everything until it couldn’t, then either hired people and prayed, or just sucked at organisational design
Can also crop up in orgs with multiple operational teams, no clear leader and a lot of feudalism
This is effectively a superset of 'hope as a strategy' that relies on multiple departments to remember to both do their thing and communicate their thing, assuming they even have enough information to do so in the first place
Approaches
If you’ve not already mapped everything out, start there. Then get everyone on board