P1 Gen 3 is 0.72" x 14.24" x 9.67", compared to the 2019 15" MBP which is 0.61" x 13.75" x 9.48". Slightly larger? Sure, but I wouldn't call it "huge" if the 15" MBP is what you're used to. It's only 0.11" thicker than the MBP and half an inch longer. (And it weighs less.)
P1 Gen 3 is 0.72" x 14.24" x 9.67", compared to the 2019 15" MBP which is 0.61" x 13.75" x 9.48". Slightly larger? Sure, but I wouldn't call it "huge" if the 15" MBP is what you're used to. It's only 0.11" thicker than the MBP and half an inch longer. (And it weighs less.)
If you think so, then I recommend you get an X-series instead.
I have a 15" MacBook Pro and I like it just fine.