Why is fixed better on wet?

i hope im not repeating anyone but in terms of wet conditions caliper brakes on road bikes, regardless of pad choice and groupset, have vastly reduced purchase on the rim. ultegra and chorus brakes i have used will be 50percent less effective at stopping and as the aluminum-wet powder crap builds up and this worsens during wet rides. A fixed drivetrain allows the majority of decelaration to be done without skidding and even during wet conditions the tyre and road friction from a skid seems to remain effective in comparison to the concentrated and lubricated area of a brake pad on metal.

Wet descent? I'll take the brakes over trying to slow down with my legs. Thanks.
Remember it's often not the braking force that's the issue, it's the tyre's grip. You don't want to be locking up brakes in the wet so not having awesome pad-rim grip is a good thing.