Think of the 2020 iPad Pro kinda of like an "S" type upgrade over the 2018 iPad ProAs I always say, a single generation upgrade is almost never worth it. The 2020 ipad pro is not for people who already have a 2018.
for example difference between
iPhone 4s vs iPhone 4
iPhone 4: A4 chip, 5 MP rear camera, 720P HD video recording, 0.3 MP face-time camera, Bluetooth 2.1, 3G up to 7.2 MB speeds
iPhone 4S: A5 chip, 8 MP rear camera,1080P HD video recording, 0.3 MP face-time camera, Bluetooth 4.0, 3G up to 14.4 MB speeds, and SIRI
Using those 2 iPhone models as an example.