You need a way to connect all your DC wires. You don’t need to use connectors, but there are pros (and cons) you may find interesting.
Pro: Connectors on your LED boards and drivers to make them easy to Swap out or plug and play. Your fixture is less permanent and easy to change. It makes your light more like a plug and play kit (think RC cars).
Cons: every connector you add is a risk point for a bad connection. Loose or broken connections can lead to arcs/fire and damaged equipment. It’s important the connectors you choose are good quality. It’s also important to pick connectors you can easily build with (i.e. does it need solder, crimps, mechanical snap fit, etc..).