Depends on how you look at it, but there are some who will argue the BCHL has an outsized sense of entitlement. They're annoyed that they can't bring a lot of underage players in from outside BC.
A 35-page paper suggests Hockey Canada needs to recognize junior A as a legit development path
www.nelsonstar.com
The BCHL's document is here:
https://bchl.wpenginepowered.com/wp-content/uploads/2022/09/Modernizing-Junior-Hockey-in-Canada.pdf
They say that Hockey Canada is restricting 16 year olds from going from, say, Ontario to BC to play Junior A, but have no problem with a 16 year old going from, say, North Vancouver to Regina to play major junior (perhaps you've heard of Connor Bedard). Hockey Canada will argue that they're trying to limit a lot of kids from going thousands of miles away from home at too young of an age (in loco parentis, and all that) and that opening it up to Junior A teams would mean an order-of-magnitude increase that would be hard to justify, given that most of the kids making that transition would wind up being middle-six guys at best on their Junior A clubs. It also leads to a beggaring of Junior A teams in weaker leagues. Alex Newhook, for example, stayed with family in Victoria, allowing him to play in the BCHL rather than playing in the Maritime Junior Hockey League.
And the BCHL isn't wrong on the Owen Power example. He left Ontario to play junior in the US. Why would Hockey Canada grant him a release to play in the US but not in BC?
So that's the why, in 35 pages. Whether it's a good why or a bad why is for someone wiser than me.