I'm not 100% certain on the technical background, so I'd love for someone to speak up if they know what's truly going on inside, but here's my take on it:
I don’t think it really ‘records the raw data’, more that it takes the raw data off the sensor and quickly processes it down to 8-bit JPGs based on the setting; the resultant file is much smaller than a RAW. I believe the buffer, and the bottleneck, is writing these files to disk, hence the bigger RAW files are slower.
I know what you’re saying, isn’t processing the RAW data to a jpg taking more time than writing to disk, but apparently not. All SLRs that I’ve ever seen have a much smaller burst capture size (# of photos) when shooting in RAW than jpg. I would guess that companies drop some cash on a fast bus to increase the amount of shots that can be captured in a burst, but on the flip side, it’s something that they’ll cut out to save a few bucks on lower end camera.
No problem. Honestly, coming from someone who has been shooting dSLR for 8 years now, I'm kind of jealous of the SX50hs. It looks like a cool little camera. I wouldn't discount it and call an SLR a "real camera". Point and shoots and hybrids have made leaps and bounds over the past several years, while SLR technology slowly inches forward. The gap has narrowed quite a bit, enough to the point where the question is starting to come back "do I really need an SLR?"
Unless you're ready to drop $10,000+ and get the best available with top notch lenses, you will always make compromises in cameras, even SLRs. Just look at all the bickering on here between Rebels and 7D and 5D3; over which has what feature. It never stops.
Your camera has a lot of impressive features/specs, learn to use those to your advantage in your photography. Recognizing what the limitations of your camera, and using your skill as a photographer work around it, is a learning and rewarding experience; it's part of the fun for me as a growing photographer. There's a lot of people out there with SLRs that will tell you your camera can't do this or that... go prove them wrong. And have fun.