Just out of curiosity, how is your workflow changing? You just using it more as a laptop replacement?
Not as a replacement necessarily...but I suppose kinda sorta. ?
I have a 2019 16" MBP that is docked in my office through a Belkin thunderbolt dock to a 34" Ultrawide and storage. Before, my iPad 11 was mainly about content consumption or for use as note taking and presenting content (notes, sheet music, etc...I'm a pastor).
In 2018 when I upgraded to my current 11", I thought about the same switch. Couldn't do it. I have always liked the idea of the 12.9, but it's just been too big for how I was working and it just didn't fit in my workflow. The benefits of the 12.9 just didn't give me a reason to give up the better portability.
I will be more mobile in the coming changes of my job and want some more portability for a production machine as opposed to just doing okay on the 11"...I can do a lot on the 11...but it always felt "forced." I can still take my 16" and will probably do so for those times that I need more power and MacOS...which can be so many times. However, the 12.9 gives me the ability to pack up quick and go...while still having a lot of production ability. The 11 just didn't have the screen space for multitasking and I use multiple apps often. I will not be producing as much video content myself, so Luma Fusion will work for those times that I may be mobile and need to create some video content.
Ultimately, I'm banking on WWDC bringing some more functionality to iPadOS with the massive hardware upgrades. The screen real estate makes it more of a production screen for me. TBH, I'm still "in between" as the 11" is still an option for me. The 12.9 is an expensive upgrade as I have to upgrade my accessories since they're all 11". But after a day...I'm still in the 12.9 camp. Looking forward to a week of workflow to see if it's gonna do what I think it will.
...and that's my $.02. ?