Perhaps some Fractal power user can correct me, if I am wrong, but I believe there are caveats/constraints in the Fractal AX3/FM9/FM3 ecosystem, if you “enable” gapless preset switching.
In other words, I believe there is some trade-offs, in which a full-blown “everything and the kitchen sink” grid/preset requires some forethought and planning if you want to achieve a gapless preset switch, while still maintaining delay and reverb spillover.