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> removing the tech again is - at least to my knowledge - in experiment phase, too.

Do you not consider the period prior to the tech? It was a significant amount of time.

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but so much has changed since

My hole point was that you cannot isolate it to phones. Phones probably are net negative, but even if you removed them: our society has changed and wherever the removal will be positive for their development is hard to isolate, hence it's purely based on opinion

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