It can often give false positives, but it's mostly okay and lots of people really enjoy it. It has innovated a lot on finding better ways of showing types.

It'd be good if the OP elaborates on what "bad tooling" we have in the Scala community given that today Scala's tooling is good and on par with that of Kotlin and Java.

It still can't reliably highlight errors. Every version of it either highlights some kinds of working code as being an error, or fails to highlight some kinds of error.

No much now (except being slow on weak laptop). Scala Intellij's plugin has dramatically improved over the years.