[D] Architecture hyperparameter optimisation strategies

I am wondering if it is worth to go through extensive hyperparameter tuning of model architecture. Learning rate tuning often pays off as this has a big impact on convergence and all around performance, but when tuning architecture (num_layers, num_heads, dropout etc.), I have found if you stay within a certain sweetspot range, the actual performance differences are marginal. Am I doing something wrong? What are your experiences with this?

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