> For example, implicit conversions are now disabled by default. It's possible in Scala to pass a Foo to a function requiring a Bar due to a chain of automatic conversions from Foo -> Baz -> BazMutable -> Bar. This is fun and magical but difficult to understand and debug. The community and language itself now suggests against this pattern.

I don't have experience with Scala 3 or Scala 2.13, but I don't believe this is true. Implicit conversions cannot be applied more than once.