Are giant open-source projects like Chrome, Firefox, or FreeBSD cathedrals? Unlike bazaar poster child Linux, these projects mostly control their own roadmap and releases, without many competing distributions.

Linux the ecosystem is bazaar, sure, but Linux the kernel is cathedral with Linus at the helm. Arguably this is what makes Linux kernel so successful and so widely re-purposed yet most distros lacking in getting any traction. There's, again, a clear exception in Ubuntu which is a cathedral amongst bazaars.

So at the end of the day I personally feel that bazaar is the best set of training wheels invented but quality ultimately gravitates towards cathedrals. Both parties do benefit a lot from each other, so mutually benefiting, implicit agreement is at play here, which is something "A Generation Lost in the Bazaar" piece fails to acknowledge.

I'd say yes. Another Cathedral bazzar is Meteor. Open source, but with a relatively centralized organization.