Only a bit important in the first year of a consoles cycle. When there are few games out. Once the catalogue build within the second year Nobody cares about BC.
Example of it is the ps3 launching with BC then abandoning it in like a year if im not mistaken. It did its job after that new games take the interest of gamers. the sales of the console are prove as the console remained selling well after removal.
Example of it done wrong the x1. It did not launch with BC and then it added it 2 years later, almost 3. By this time there where plenty of new games out that legacy titles could not compete with so the x1 saw almost no boost from such a feature. They thought BC would replace the lack of games they where developing and that would never be the case.
But like the switch if your line up of games is very strong withing your first year then the need for BC is zero as we can all see. The subsequent years where not as strong as the first but it dosent matter as the momentum was already build.
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