I have a question about hypertrophy training based on the above. With any type of training are you not just trying to lift the heaviest you can just with a higher rep range in hypertrophy based training? In which case wouldn't a belt be useful as it would be just as difficult?
If you're not lifting the heaviest weights you can, when would you know when to move up?
I view a belt in the same way as any equipment; they're just tools to assist the athlete in specific circumstances and because I'm bored at work on nights...
~ WL'ing shoes: the raised heel essentially gives you more dorsiflexion than you'd have available normally, enabling a more upright position at the bottom of a deep squat. More forward knee travel on any squat pattern type movement places more demand on the quads. If the goal of a squat, leg press etc is to build the front of the legs and use full ROM, then WL'ing shoes > flat shoes
~ straps: for something like RDLs, my grip will give out before my posterior chain, and my goal is to develop the latter, so it'd be illogical to not use straps for this movement. Additionally for some back movements, by using straps which reduce the need for a death-grip, it allows the athlete to execute the 'pull with the elbows' cue better and feel a greater contraction in the lats etc.
~ wrist wraps: for pressing, keeping the bar stacked with the wrists/elbows allows for greater transfer of force, and wraps help with preventing the wrists from going into too much extension on a heavy bench press, for example. Wrist and forearm strength can be developed, but joint sizes differ between people, it's not something you can do anything about, and for those blessed with skinny wrists wraps can be a godsend. Also for low bar squats, wraps help many lifters with taking some strain off the wrists (I rarely see anyone serious about powerlifting not using them actually).
~ belts: used properly a belt augments core tightness which helps with any sort of lift with axial (spinal) loading. While there's certainly an element of 'learn to squat first, then worry about belts and stuff', for most people once consistent tekkers has been developed and squats start getting challenging, it's more likely reps will be missed because of something other than pure leg strength, so if you have a tool that offsets that a bit and allows you to get more quality work out of your legs...
~ liquid chalk: duh
Also regarding hypertrophy training... this video came up today and as usual Dr. Eric Helms (who coaches a world champion powerlifter in Bryce Lewis, who himself is an excellent coach with The Strength Athlete) and brings up an important point about why training purely for size is less complicated than for say, maximum 1RM strength in a powerlifting meet: