Yes you need to glue it well but regardless, here are some other ideas.
1. When gluing endgrain you can do what's called "sizing" to add
strength. You first put on a tin coat of diluted yellow glue, maybe 30%
water added and let it dry, then glue the joint normally. This will add
2. Face frames do not typically endure much pressue to the corner
3. In production shops we do not typicially use biscuits, just pocket
screws and glue. You can use both if you wish. We use a commercial
pocket screw machine that makes pockest at only 6 degrees, as opposed
to the 12-15 degree pockets of smaller Kreg type pocket holers, so we
don't suffer much rasing of the joint by the screw. A biscuit can stop
this. Regardless, we use a clamp positioned mostly on the piece you are
screwing too with just a lip over the piece you are screwing in,
clamped down to the table. This keeps the pieces in enough alignment
for minimal sanding for a flush fit.
4. Once attached to the cabinet the FF is very ridgid. We do sometimes
use biscuits to keep alignment of the FF to the case but you have to be
very careful with your layout. [Pointer, we keep a large number of pipe
clamps on hand just for FF to case attachement. We use glue only so we
have no Norm holes I mean nail holes to patch.