I think from a purely economic stand point this is a must for knacks long term competitiveness now that Microsoft Power Apps provides just this. The whole point of a data base is to reduce data entry and keep things real time. Here are some of advantages this offers your clients:
1) we can build many simple apps as part of a development road map instead of one large app.
a) This means clients will move into production faster.
b) on boarding becomes much easier as the learning curve is distributed across app workflows.
It basically makes knack a custom CRM provider instead of form builder.
You charge per app and record volume!! More small apps means more money for Knack!
Clients can bring more and more processes onboard knack overtime - fundamentally resulting in higher client loyalty.
Developers can bill their clients better build apps for them faster makes.
The list goes on. It'll solidify your competitive advantage as a business development consultant I really can't see another feature that would offer both the client and knack a better return on investment. Instead of duplicating what others do better (webmerge,etc.) Knack is better off concentrating its efforts on what it does best - organizing people's data and data collection.