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What's the problem of implicit arguments in scala? I can see why implicit conversions can be a problem but aren't implicit arguments required for typeclasses and other nice features?

You should read the paper :) Modular implicits are not the same as Scala implicit arguments. Gluon probably just chose the name "implicit arguments" because it corresponds better to their variation on modular implicits.

What's your opinion of Odersky's scala3 implicit plan?

I'm not very familiar with Scala3, but as far as I'm aware implicits are still a core part of the language?

Let me put it like this: I recently applied to two high-profile startups with experienced technical leadership, and they both explicitly asked me if I was a Scala fan. They weren't and made bad experience in the past regarding productivity due to complexity, tooling and developer onboarding, which unfortunately matches my experience. There is some good stuff for certain niches (Akka, Spark etc.), but otherwise I feel like Kotlin is winning.