Took Apple 10 years to finally give iPads wireless mouse and trackpad support, when iPad users were clamouring for this feature since the original iPad!
You do the math and figure how long you think it will be before Apple will open up iPadOS full support for their 10-year old
Magic Mouse 1 and Magic Trackpad 1.
Seems like commonsense to me that Apple is not going to backwards support their 10-year old input devices on iPads when Apple is still supporting their 5-year old MM 2 and MTP 2 on many Apple products.
I own a iMac model that is NOT even compatible with the current MM 2 or MTP 2. My iMac is stuck with the option of the original 2009 MM 1 and MTP1 as these are the Apple input devices that were compatible with my over 10-year old, late 2009, 27 inch iMac, back then.
When the MM 2 or MTP 2 and Magic Keyboard 2 came out in 2015, my 6-year old iMac, then, did NOT support these now updated input devices. My iMac got left out!
Did I “birch” about that? No I didn't.
I found very good third party alternatives that have been working for me just fine and dandy for the past 5 years!
So, I do not even want to purchase a MM 2 or MTP 2, now, just to use with ONLY an iPad.
I will patently wait for cheaper, third party mice/trackpad makers to design and make new, fully iPadOS compatible set of wireless; Bluetooth mice and trackpads that do not have any issues or glitches with newer, future versions of iPadOS.
It is not going to happen for the MM 1 or MTP 1.
Sorry.