Finnish was often a go-to example because it more or less had every feature enabled.
Case and declination? Sure. Tenses? Yes. Agglutinative? Yes.
It was asserted that there a disproportionate number of linguists are Finnish because their language is a superset of many others, and by necessity almost all Finns are multilingual, and that when they are, the language families they tend to learn (Germanic, Romance, and Slavic) are all distinctly different. So by the time Finnish academics get an advanced degree their language faculties can be extraordinary.
EDIT oh yeah gender was the exception to the feature flags