I agree 100% Vocal effects are definitely necessary to make a beautiful sounding recording. I agree Warning, AI and 21st CB has Billie's best sounding vocals, and they are very professional sounding with the right amount of effects: compression, etc. That is why they sound so crisp, and clear in the mix and professional sounding. Without the (tasefully done) effects you lose that quality.
Weird, there's some guy that does that on Instagram.
Random thought: I love the piano on "Restless Heart Syndrome". That song is so heartbreaking and beautiful and the piano is perfect. There had better be at least one piano song on the the GD album!!!