- the license was very expensive and the commercial relationship felt predatory
- new features got added all the time, while long standing bugs weren't prioritized (e.g., mobile apps support)
In the C++ variant (a combination of C++ with Delphi wrappers):
- the compiler(!!) was unstable and crashed a lot, where you had to make small irrelevant changes to your code to make it compile without crashing itself
In general:
- the overall culture around it seemed to attract developers without concern for technical debt, which maybe was a consequence of Delphi's own strengths; i.e., every Delphi project was a big ball of mud that you had to fight against
