Yeah, you really don't understand the problem. Clearly. External drives aren't the problem. The problem is that even with an external Blu-Ray player, OSX is incapable of playing Blu-Ray disc content. There is no software application in OSX to play Blu-Rays. You have to boot camp to Windows (or I've heard Parallels can now handle it too). Either of those options is crappy though; OSX loses the pretty polish when I have to leave it to use an application.
The top-end Blu-Ray player is called a Play Station 3. And that device is not ideal for doing non-disc playback, like browsing the internet, viewing my photos, etc. The best top end solution is an HTPC, that way you have one device handling everything. But without Blu-Ray support, a Mac-based HTPC can never be the best HTPC.
What? I'm using an internal Blu-Ray drive and burner with software that supports playing Blu-Ray disks and I also have software for burning blu-Ray disks. So what are you talking about? This is on my Mac, not in Bootcamp.