> Well, idealism simply says that consciousness/humans cannot be understood or explained via simpler concepts. That's the first thing anyone would think of but it is not a useful theory in any way.
It doesn't just naively declare it. It reasons it. Idealism never discouraged scientific research. It's simply identified consciousness as being its own category among a set of other categories of problems. One which is beyond our available tools and methodology. That our scientific zeitgeist chose to ignore those hints and proceeded to waste resources chasing its tail is our current reckoning.
> This second approach have turned out to be very useful for explaining many things. It did not explain consciousness so far but we now have many directions to explore.
What exactly has it yielded? There are few serious physicalist researchers working on consciousness nowadays. Not one person on this planet could tell you anything scientifically meaningful about consciousness. None of the big names, Tononi, Koch, Hameroff, Penrose, Seth, etc. The best you'd get out of them is that we now have even more tools giving us better indications of correlates of consciousness. That is, while they all set out to find answers about the engine, we've actually made tremendous progress on the dials. So I guess we could say that these approaches have been valuable in discovering in practice all the theoretical dead-ends that idealism predicted.
At least idealism is proposing a paradigm shift, consciousness first. Not an unreasonable proposition either, since it's consistent with every constraints set in cognitive science and in physics, with the bonus of solving in the process various philosophical problems about consciousness.
> So while neither position is proven so far, idealism is worse than wrong, it is useless, and if most people believed it, today we would know not much more than ancient Greeks did.
A position taken when you either profoundly misunderstand the philosophy, or when you have no clue how to use insights it gives you. Luckily it's not a universal outlook, since we're obviously now seeing scientists reorienting their research based on those inputs, away from fallacious intuitions.