The 2019 MacBook Pro 15" with Touch Bar earns a 1 out of 10 on our repairability scale (10 is easiest to repair):

The trackpad can be removed and replaced with very little drama.

The processor, RAM, and flash memory are soldered to the logic board. Repairs and upgrades will be impractical at best.

The top case assembly, including the keyboard, battery, speakers, and Touch Bar, is glued together—making all those components impractical to replace separately.

The Touch ID sensor doubles as the power switch, and is paired with the T2 chip on the logic board. Fixing a broken power switch may require help from Apple, or a new logic board.