To make a ton more power. The downpipe actually restricts the stock turbine flow. Slightly faster spool without out it, and you can absolutely adjust the boost with a ProTune/JB4/Other Piggyback.
As to why you'd go catless unless you're BigTurbo™, I have no idea.
I'm not sweating it. I did some driving last night monitoring IATs. After an hour of driving in and out of Chicago traffic, I saw a drastic reduction in IATs, 10-20 degrees in similar weather conditions for similar driving. I'm very happy with the outcome.
I've been FT remote (actual FT remote, not "work from home") for almost over a decade over a few jobs. But I wasn't speaking during pandemic times, just generally.
Pedantics aside, you can tune the car, It's basically a matter of cost. all 2020s and some 2021s can be tuned, but you'll need a bench unlock by a tuner.
Yeah, I've been torn on them since before I ordered them. They do keep the air pressure out of the wheel wells, which is really all I care about. I think I'll probably remove the top set and re-test and see how that goes.