I think Kreg joinery has it’s place in certain situations, but certainly not for everything.
For example, I used it in the cabinets I did recently. The face frames were all PS’d both to join the stiles and rails, and then to join the face frames to the carcass. Its a very strong method of joinery, whether its proper or not. A nice benefit of using them to join the Face frames to the carcass is that there are no brad or pin holes to fill. Sure, I could have run a dado along the back edge, and joined it to the plywood that way, but this was quicker, easier, with less opportunity to muck it up (Also, dont have a biscuit joiner and can’t afford festool products). It takes me long enough to do cabinets as it is. I can’t see adding any extra time for M&T joints and glue to set up when pocket screws are faster, strong enough and will never be visible.
I wouldn’t use it on a jewelry box or a Krenov influenced cabinet etc, but for kitchen cabinets (face frames only)…I won’t think twice.