Limitations for what? I'm being a little facetious, since I know some people run into issues. But for me...
- I access all my files from iCloud and DropBox, so sending things to/from my home Mac or work PC hasn't been an issue.
- Editing & marking up PDFs has always been easy with iPadOS. I use GoodNotes and it's easy to flatten and email those PDFs to others. Works great with the Apple Pencil and I can split-screen multitask with other apps if I need to follow along on one thing and take notes in the other.
- I get my personal and work email on my iPad (Apple's Mail for personal and Outlook for iPad for work).
- I can access two specific applications for work via Citrix on my iPad (and I'd have use Citrix on any personal device, anyway - Mac or PC - per work IT security policies).
- Word and PowerPoint files are no problem. The occasional Excel file also works fine on my iPad. Any documents where I need more of a substantial page layout app, I use Apple's Pages and send them off as a PDF. Otherwise, if sending things to others, I can export my Word files as PDFs right from my iPad.
- Accessing textbooks on Kindle and Apple Books works fine on the iPad.
- I can drag and drop images from Safari or Photos to Word, PowerPoint and Pages files and such.
- I usually just split-screen a couple apps when I need to multitask, but occasionally switch to Stage Manager if I need more than two apps open at a time.
- My password manager is 1Password, and there is a version for iPadOS/iOS which synchronizes with my personal Mac and work PC. Otherwise, Safari & Apple's built-in password manager does fine.
- My image editing needs generally come down to basic crop and zoom, so manipulating images has never been much of a problem. Occasionally I scan things with SwiftScan on my phone which I can save to iCloud, DropBox or just email off to someone.
- Zoom & WebEx work fine on my iPad if I'm not in a location that I can use my Mac or work PC.
- And when I need them, I have a Magic Keyboard case for my iPad, as well as a magnetic upright rotating stand and an external Apple keyboard and trackpad for those times where editing documents on my iPad in portrait works better.
- If I really need a bookmark from my work PC's Edge browser, there's a version for iPad and I can sync with my Microsoft account.
I mean, perhaps my work is relatively simple, but I've never had an issue where I had trouble getting documents into or off of my iPad.
I don't do any coding, so I suppose those kinds of limitations don't apply to me.
Otherwise, I'm remarkably productive on my iPad Pro. When at my desk, I'm used to multi-monitor setups, but when mobile, my iPad and iPhone cover 95+% of my needs.
The only thing I
can't do on my iPad is access my workplace's network storage volumes, but this is not the fault of iPadOS/iOS. It's the draconian IT policies of my workplace that limits access (including on any other personal devices). So, generally, if there's a file I'm going to need, I'll copy it over to my iCloud or DropBox beforehand when I'm at work or from my workplace-issued PC at home.