Well there's a reason all the WYSIWYG UI editors died out. They are a quick way to whip up a passable UI, but usually turns out to be quite ugly under the hood, hard to reuse, and a pain to maintain.
Delphi is really from a different age, simpler times, when the common paradigm was having the app directly connected to some sort of SQL database, which serves as a stable, static data source for the UI. Making glorified database editors is what it was really good at.
These days.. things changed. UIs need to be flexible, reactive, reusable, adaptable. UIs that can handle uncertain states, asynchronous data flows, change dynamically and so on. SwiftUI / React / Flutter all ended up at the same paradigm, it's a much more advanced way of doing things. Also, high level languages are much more pleasant to work with.
Delphi still delivers unmatched productivity when it comes to designing UIs and writing maintainable multi platform software.
Delphi's FireMonkey framework has a lot of things right and you can create resusable forms easily, where you don't have to fight with a declarative UI (This paradigm is an anti-pattern and totally misplaced for UIs).
There are many multi platforms apps made with Delphi which are by no means "a glorified database editor" ;)
> They are a quick way to whip up a passable UI, but usually turns out to be quite ugly under the hood, hard to reuse, and a pain to maintain
That's not my memory at all - even web-based traditional ASP apps made it relatively easy to use WYSIWYG form editors that modified the code as needed. But expectations around how dynamic UIs are supposed to be have changed. SPAs in particular are not very amenable to auto-code generation, but supposedly some options do exist (retool? Haven't tried it though).