[orangecat]

We probably use 30-40% of TS features and that is more than sufficient for us

Exactly. Some people seem to have the idea that you have to spend weeks writing esoteric type definitions before TS will work for you, which is just not true. You can get a large portion of the benefits with very little additional work, often just adding types for function arguments. (In many cases those types can replace comments that were trying to convey that same information, with the advantage that they won't get out of sync with the code). And for code that intentionally takes advantage of dynamic typing, it's perfectly fine to slap "any" on it rather than trying to come up with a bunch of clever types.