It felt heavy for me because I was used to the Switch. Since I haven’t used the Switch (actually sold it 6 months ago) it feels normal now.

What doesn’t felt right then nor now is the straight shape of the handles and I think that this might be confused with heaviness because it is what makes your arms feel tired. Every other modern controller in the market has handles that are pointed outwards which follows the shape of your shoulders in relation to the forearms when holding the Deck (unless you have really small body like children do). I hope they review the general ergonomic of the device in the next iteration.