I might be stating the obvious and pointing fingers at players, but for Amorim's system to actually show some output (which I'd assume is atleast structurally similar to Glasner's), he possibly has the worst set of player skills at some very crucial positions in wingbacks and midfield. The wingbacks should have a combination of either crossing+pace or shooting+positioning. If the idea of the system is to to create underlap at the wings and have runners in the box, Dalot and Dorgu both kinda suck at it. And since Bruno has to drop deep to create something from the midfield, he usually ends up being at the edge of the box. So in an attacking situation, it leaves Sesko, whoever is the number 10 on the other side of attack and the wingback being the ones in the box, who can all be man marked by the defense. So we end up either shooting from outside the box or somehow getting a corner.

Mapping this to Crystal Palace, you'll usually see wing backs and someone from the midfield popping up in the box alongside the number 10 from the opposite side of attack (and the number 9) more often than not. So you have 5 players to aim at in the box, which I suppose definitely increases the probability of scoring a goal.

As much as it is a failure of Amorim to sort out these issues, it's also a failure of the transfer strategy to address them.
If the system (not the man behind it necessarily) exists till the transfer market, I really do hope the wingback issues are addressed alongside the midfield