Every "simple app builder" I saw ended up with the problem that it grew with its audience.
All their feedback came from the top 5% of their users who were always pushing its limits and clamoring for more, which ended up making the product too complicated and blocking it off for new users. See also the evolution from VB6 to VB.NET
(HyperCard's problem was that Apple was a completely dysfunctional organization. At one point it was being rewritten to be embedded into QuickTime, which could have saved it and made it work online, doing what Flash did, but alas)
All their feedback came from the top 5% of their users who were always pushing its limits and clamoring for more, which ended up making the product too complicated and blocking it off for new users. See also the evolution from VB6 to VB.NET
(HyperCard's problem was that Apple was a completely dysfunctional organization. At one point it was being rewritten to be embedded into QuickTime, which could have saved it and made it work online, doing what Flash did, but alas)