The current iPad Pro is still very fast and able to basically do almost anything a person needs. Your average consumer isn’t going to care that a possible refresh is 4 - 6 months away. Places like MacRumors are where too many people get hung up on having to have the latest specs so they can say they have the latest specs, even though they probably won’t be able to make complete use of the capability of the current iPad.
People on these forums represent a very small minority of Apple product purchasers, I think most on here sit and wait unnecessarily because they will get 5-15% more efficiency on a small task by waiting until the next upgrade. It's the "wait until they refresh" spin cycle. I say if you need something now, get it because unless you work for Apple and they haven't announced, you have no clue when that refresh will be. And because this is Mac"Rumors" often the rumored release time-frames are waaaay off. I mean we had folks proclaiming the week of the 2020's release that a super duper iPad Pro refresh would come at the end of 2020, heh.
The iPad 2020 brought more than just a LiDAR camera. It brought 6 GB of ram to all models, doubled the storage space on most models for free. Wifi 6 (minor), better camera, and another GPU core. It's a nice refresh. The Pro model of iPads don't seem to follow the iPhone strategy, as I feel Apple withholds features to make their next model appealing (USB C, 120 refresh, etc etc).
The speed of the 18 and 20 is still amazing. Sure a bump in processor is welcome, but who really sees the difference given that almost no Apps push the current Pro? For the very few people that are using it for things like video editing and export yah they'll see the bump. But for the vast majority who use it for content consumption, minor productivity, and web surfing any perceived bump will be negligible.
I'm not trying to justify my 2020 purchase, at the time I wanted it and didn't want to wait for incremental improvements, because I'm sure the 2022 will also be awesome so don't buy the 2021! 🤣