Gameplay Sliders are a powerful set of difficulty adjustments you can make to dial in your experience. An excellent practical application is to use them to tweak your specific difficulty level for games. For example, if you find Pro difficulty too easy but All-Pro too hard, you can set your game to All-Pro but lower the QB accuracy and WR catching abilities to even the odds.
You can also use the sliders to help tweak possible changes in the engine. Madden NFL 19 features far more dropped passes than previous iterations of the franchise, and if it’s a chance you don’t like, you can increase WR catching abilities to help your players keep their hands on the ball.
The player and CPU skill bars can be adjusted independently. In local multiplayer games when human players are on opposite teams, the CPU skill bars will be ignored while the player skill bars will apply to everyone. When playing online multiplayer, all skill bars are ignored. However, Electronic Arts may tune the game themselves and require you to download their own tuning data to play modes like Madden Ultimate Team.
If you make changes to the sliders in the main menu, you can then save those sliders and import them into Franchise by navigating to the Franchise’s settings, selecting Gameplay Sliders, then pressing Triangle (for PS4) or Y (for Xbox 1) on that screen. However, you cannot export the Franchise’s sliders nor undo an importation without manually readjusting everything, so be careful.
Although skill bars cannot be adjusted during games, they can be adjusted any time between games. If you play half a season in Franchise and feel running backs are too powerful, you can adjust them as necessary in the League Settings screen. Any given Franchise files’s sliders are independent of other Franchise file, allowing you to have multiple files with vastly different experiences.