Hi again Mecho,
Like the last time, you've made a great start. Here are some random comments.
You might want to add split boards to your board type, These boards are used for back country skiing. They split down the middle to turn into cross country type skis so the riders can more easily hike back uphill.
Also be aware that rocker boards are also on the market. These have reverse camber to work better in powder.
Split tail boards are pretty much obsolete these days.
Freeride boards are directional more because the bindings are positioned more toward the tail.
Alpine boards generally have a squared off tail and hard plate bindings. You say you won't discuss the bindings in the board section, but you mention them in the boot section - oops. If you're going to mention them you should explain them. FYI - There are a lot more alpine boards in use than split tail boards.
The board sizing calculator is a bit odd, but worked fairly close for me. Note that it's hard to find boards over 168cm long. You also might want to consider being more specific about measuring to your mouth (e.g. use lower lip instead?) and a link to an online calculator so we can convert inches to cm.
Unlike skiing bindings, snowboard bindings will not release your foot if you have a bad crash. This does not cause problems however, since both feet are bound together with the snowboard, and it is a lot harder to twist your legs.
Non-releasable bindings do cause problems. They are the primary reason why wrist injuries are the most common injury to riders.
Step in bindings are almost a religious issue. My comments are biased, but so are the ones on your page. I've ridden several types and have the opinion and experience that
"but they also compromise on their performance and adjustability the most. They have no straps for adjustability, and are not as stiff and responsive,"
is simply not true. The high end step ins I used had a difference in feel, but no difference in performance. Saying adjustability is compromised is like complaining a boat's steering is compromised because it has no wheels. The advantage of no adjustability in the boot to binding connection tightness is that step ins have a consistent tightness. It's hard to make strap connections consistently tight. High end step ins are generally stiffer than strap bindings because of the all metal connection between the boot and the binding and the generally stiffer boots. Step ins do get clogged with snow, but straps break. I'd say "Step ins have a reputation for lesser performance and getting jammed with snow, but
are easier to get in and out of than strap bindings. Most step in users prefer this convenience to any loss of performance or inconvenience from snow stuck in the binding mechanism." The systems that don't have highbacks in the binding have a highback built into the boot. These designs were intended to make the rental process simpler by eliminating a need for adjusting the highback.
For boot fit, you should mention that women often have problems where the boot will not hold their heel in position. This makes it harder to make toe side turns.
For determining regular or goofy, it may be simpler to say stronger foot goes in back. Some people with skateboard or surfing experience may prefer to ride strong foot in front. If you're unsure, use duck. Duck is another option to regular or goofy and should probably be moved up into that section. Duck stance is also good for freeriding. It is more comfortable for people who are naturally bowlegged or people who naturally stand with their toes pointed outward versus having their feet point straight ahead.
The angle of the highback is also adjustable, and will change the responsiveness of the bindings when you lean backwards
Change lean backwards to make heel side turns.
I don't see any mention of leashes.