Love your product, but the lack of user permissioning in Airtable is holding back both a) the companies that use your product and b) the growth of your company.
While you think of yourselves as a new-breed “collaboration tool”, it is clear from comments in this thread that many companies are trying to use your product as an SAP-like enterprise management tool (ERP).
Airtable enables companies to easily create and manipulate very stripped down cross-linked databases (without all of the baggage and cost of traditional ERP tools like like SAP) and immediately publish the data for distributed availability and use, including on mobile devices – all without any required specialized knowledge other than basic spreadsheet skills. That is super powerful and does not exist elsewhere!
However, without better user permissioning, companies using Airtable are unwilling to use it broadly and invite more (paying) users into the database because there is no way to allow users to view/edit data without granting access to view/edit the entire database.
You are missing a massive opportunity here. Look at capterra.com and all the software out there that has been created for specific end-markets (here is the list of just the categories of software: http://www.capterra.com/categories). Airtable could be used for just about all of those categories.
By contrast to software developed for specific end-markets, a product like Airtable is 100% flexible so companies can set up their data and processes exactly as they want them and they can manage data and processes across the entire enterprise with just one database – essentially companies can create and easily roll out their own custom enterprise software.
Your target market is enormous and you have the opportunity to be the first mover. But I’m afraid if you don’t address users’ needs re: permissioning, somebody else will come along and build a similar product that does.