Going fast on the MTB is at least as dependent on technique as aerobic conditioning. The technique seems to be about training the mind and body with a much more complicated center-of-mass/bike position model than is required for road biking. Of course that model is all based on "feel" and experience rather than a conscious physics model. The conscious mind model is too slow to pilot the bike effectively and efficiently.
On the mountain bike, efficiency is key, and efficiency means not braking too much for a corner or difficult section. Braking for every corner is one of the things that really drains all the speed/kinetic energy from the mountain bike/rider system, and then of course requires the rider to replace that energy from their legs, so it's also quite tiring. The inefficiency drags the average speed way down.
However, it's quite "scary" to try to maintain speed through corners, especially on steep downhill sections. The fear is really a manifestation of the lack of a good mind/body model for the mountain bike. The temptation to grab the brakes is almost impossible to overcome, for very good reason. The conscious mind "knows" there's a big gap in training and there's no mind/body mountain bike model to rely on.
Unfortunately, building up that model involves crashes. I just crashed yesterday while trying to "flow" through a "fast", but relatively flat section of the trail, but it has turn after turn after turn, plus little bumps and dips. I resisted the temptation to get on the brakes and tried maneuvering through each turn. Eventually the front wheel washed out on some soil that was loose and slippery compared to the rest of the corners and down I went.
A few minutes later, I realized my mistake "consciously", that I was off balance on the bike in that corner. My weight was too far back and probably shifted to the wrong side of the bike, that is, on the inside of the turn. Anyway, the whole of the mind/body model for the MTB seems to be about keeping the center-of-mass of the bike body system optimal over the wheels all the time, then developing a feel for the limits of the wheels for given soil conditions. When the center-of-mass is well positioned, it's possible to safely bail out of a bad situation, or to slide through a turn even when the wheels lose group.
The inability of the conscious mind, that is the "self" or the "ego" to wrangle with 3D reality is very common. One variant of this problem manifests as "worry" which is fairly similar to the "scary" feeling on a mountain bike. Worry is low level nagging stress that some situation is "out of control", that is, "unknown".
On the MTB, the "scare" feeling is the conscious realization that training is inadequate to handle a given speed through a turn. The "scare" feeling is transient--it lasts the duration of a turn which might be 2 seconds. Since the only way to get better is to train the turns there's no point mentally obsessing on it.
Worry is the consciousness trying to play out many different scenarios in an obsessive manner. It's generally worthless compared to the mountain bike training and learning process. People worry about work. They worry about love, family, finances, etc... Some people are worried their entire life. The "worry" scenario is all imagined, but it leads to adverse physical consequences, like higher cortisol levels which are the "bad" and "heavy" feeling.
A corresponding mode of consciousness to worrying is "enduring". The person who decides to "endure" their worry and heavy feeling has a model that they'll "get to the other side" eventually. That is, by struggling, they will eventually "make it" or succeed and their burden (the cortisol dose) will eventually go away. There are various sayings and folk-wisdom phrases associated with this mode of consciousness, e.g. "it's darkest before the dawn".
The enduring mode of consciousness is foolish to indulge because the "worry" is all imaginary. Old Obi-Wan's advice to "let go" is really good. The "go with the flow" model is really all that can be done anyway. The recognition of the reality of given circumstances is the best antidote.
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