We have not copied the UI. We've been used a spreadsheet style interface as the base, which is existing even before Airtable started (read Excel).
For us, the biggest differentiator is that we're API first, we're giving users a no-code way to connect columns to APIs and bring information right inside the tables and refresh/automate in real-time.
I particularly struggled in my last corporate job, juggling through spreadsheets and manually copying/pasting data from different tools in my spreadsheet where I could easily do it automatically via APIs. But again, it would require technical knowledge to do it.
We're making it easy for non-technical users to access those APIs in a no-code way and build powerful tools for their lives and work.
You will see we'll continue to differentiate both on UI and functionality as we move forward.