What do you mean you don’t understand? When you buy a computer you expect to have updates and features that will come through the years . iPad Pro are worth a thousand dollars for the 12.9 inch for the cheapest model so you would expect to get a future proof device and 2 years isn’t future proof . So what don’t you understand exactly? This is software base update and the ******** about M1 is simply ridiculous…. iOS devices has been arm based since day1 and they were Apple chips since day 1 the only difference is that the name changed and they are using the “it can only works on m1” cause since the name change they can say that the way it works changed but this is not true .Never understood this type of comment.
Your "Pro" device does and will still do what you thought it was doing, you were never promised anything forward.
You based your decision on what it did for you not what it might do in the future (as nobody could guess), your 2 year old device wont suddenly stop being pro or doing it's work.
You are missing on features from the new OS, features you didn't have before, but the HW you have is still as good and as zippy on the new OS.
Bottom line, ALWAYS buy stuff for what they are capable the day you buy them, never buy things hoping they will do more in the future.