I have a 9.7 iPP from 2017 and a 12.9 iPP from 2018 it's a really good combo, but I might just retire the 9.7 and get myself a refurbished 12.9 2018.
My current 12.9 is 256GB + Cellular so it would be my main one and the refurb I'm looking for is a 64GB WiFi. Apple seems through their refurb stock fast on these so I haven't had much luck yet.
I sometimes double my iPads as monitors from my 2018 i5 Mac mini with SideCar and Luna Display (though when using both together I would have to have the iPads wired to my Mac mini via USB-C to have ethernet running for less lag).
I've debated on getting a new MBP as I'm currently rocking a Mid 2012 13" Unibody i7/16GB RAM/256GB SSD +1TB 7200 RPM HDD, however my iPad pretty much replaced my need, and LunaDisplay lets me use MacOS on it as needed.
Don't need an iMac either as I'm currently using a 2013 Mac Pro 8-Core/32GB RAM/256SSD/D700 and TB Display for heavier photo and video editing, and for my actual job I use dual 28" Samsung UHD monitors with my gov issued dell laptop, so there goes most of my space.
Edit: They just loaded some refurbs on their site and I ordered one slated to arrive Friday.