Solar MC4 connectors - needed? Why?

I'm in the early planning stage of doing a solar install on our fiver. I see the MC4 connectors and combiners are commonly used, and I wonder why, and if there is a reason why I could not just solder and seal the conductors between panels, and even between the array and the leads down to the controller. It doesn't seem like a common thing to have to replace a panel. At least not common enough that you would need a quick disconnect. I understand the connectors also make it idiot proof as far as polarity, but so what?

The MC4 connectors are cheap enough, so that's not an issue, but it just seems like a lot of fooling around with pins and housings, for no benefit. I like soldered joints when practical.

Opinions?