It is good design only if it's good. The prevalence of Indy games in modern gaming culture has taught me that games should stick to what they do well. If exploration is a meaningful and engaging element it can be excellent. Most of the time in RPGs it's a drag. And even if you don't like it, the influence on the parts of the game that are good means you can't skip it. In an RPG, collectables is something I never interact with because it's boring. I am however getting every usable item there is even though I don't enjoy doing so.