Josh OSUIT wrote:
This answer is not helpful in the least bit - the OP's issue is the same as mine. I have a freshly wiped 64gb iPad mini that I just updated to iOS 27 and it has 22gb of system data and 11gb of iPadOS on it. That's 33gb and HALF of the devices available storage just for the OS and "system files". It's a known issue that so far apple has refused to address. My iPhone 18 Pro has 22.3 gb of iOS data and 36GB of System Data and it's a 256gb model. 25-30% of my storage is unusable due to how apple OS is holding onto data.
You are of course entitled to your own opinion - as potentially flawed as it may be. Please remember that your own situation may differ from that of the OP.
Perhaps consider that recent versions of iPadOS, in particular iPadOS 26/27, make considerably greater use of available internal storage for downloadable LLM software-assets and cached data. This data is included within the reported System Data - and yes, this does consume a considerable proportion of local device storage. That said, there are instances where cached data can become orphaned - and is not purged as expected. In such situations, the remedy is to backup the iPad, erase, and then restore from the backup - this process eliminating all temporary and orphaned data from the device.
For the older lower-cost iPad models with only 32/64GB of internal storage, System Data can consume what may appear to be a disproportionate percentage of device storage. By example, my own iPad currently reports ~29GB of System Storage - this fluctuates by a few GB as temporary cached data is purged and replaced by fresh data.

Also consider that due to increased demands upon local storage, Apple no longer markets any model of iPad with less than 128GB of local storage. This, for some users will be adequate for their needs - but many contributors here would advocate that you purchase a device with at least 256GB of local storage.
Whichever iPad model you ultimately choose, you would be well advised to purchase as much internal storage as your budget might reasonably allow - as internal storage (and other hardware) cannot be changed, upgraded or extended as your needs, or that of iPadOS, grow over time. The available internal storage is fixed for the entire life of the device. If you run out of internal storage for your documents, photos and other data, you will forever struggle and become a source of frustration. It is far better to have more storage than you need, than to need more storage than you have.
A good rule of thumb is to quantify how much data storage you will need - add a healthy margin - then at least double it.
Within the Apple Support Communities we see regular tales of woe and disappointment when storage requirements are exceeded, necessitating replacement of the device; by contrast, we never see complaint of having too much available storage. It is relatively easy to fill limited internal storage space; perhaps consider higher tiers of storage as providing room for growth as your needs develop or mature - potentially extending the useful life of the device.