Length comes first
When people focus only on symbols, they often miss the bigger factor: length. A longer password or passphrase usually adds more real security than cosmetic complexity alone.
That is why a good generator makes length controls prominent and easy to adjust.
Usability still matters
A polished generator should let you avoid similar characters, copy results quickly, and see whether the current settings create a strong result.
Those details make a tool genuinely useful instead of merely theoretical.