Problems with NoCode App Development?

(1) Reaching some place where "you can't get here from there" in terms of functional requirements (e.g. there is some cliff of app complexity where it either gets much harder

(2) Being stuck with non-functional requirements. For instance you have a form that works but you think it is ugly, not compatible with your brand, etc. This can be a blessing in disguise because if bikeshedding is impossible there won't be any bikeshedding.

(3) A modern NoCode system is likely to be a SaaS. The plus of this is that you are also absolved of running a server but the minus is that they can go out of business, raise their rates, reduce your server power, or otherwise change the deal.

The steeping cost later on when scaling the app.

You'll find lots of insights in other posts and comments on HN. Search (at the bottom) is your friend