they're glued to it, biscuits are more than enough, even if you put them at
right angles to the joint from the rear.
The less support the joint has from the cabinet, the more you want to
consider the shear strength of the pocket holes, though I'd bet that
biscuits attached in the conventional way are as strong in shear, just
lacking in pull-out.
Use both, where applicable.
Biscuits align easier. Pocket screws 'clamp' faster.
If you're doing hundreds, speed matters a lot. If you're doing your own
kitchen, once, you can afford to move a bit more slowly.
also a fan of good assembly tables with clamping points...
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