Blogger and gamer
Yeah, for me, netdecking lets me focus on understanding how the deck works on a fundamental, deep level. There's tons of things that pros have internalized about deckbuilding, like how hard you have to commit to a deck's gimmick, and what type of support you need for it.This is like 95% of the playerbase. Top tier decks are too optimized, being usually designed by pros then tweaked and refined by millions of players over millions of matches. It becomes really difficult to just invent a new competitive deck archetype, particularly if you don't have a massive collection. In that sense for most players "deckbuilding" is usually only a relevant skill in Hearthstone laddering during brawls and very early in most expansions.
What is more common is to netdeck, the subtly tweak it for what you're seeing on ladder. A lot of decklists you'll find online are from pros playing in a different meta than you may be seeing at your rank on ladder, and recognizing when you should, say, cut some draw in exchange for golakka crawlers or whatever is definitely a useful skill and a big part of climbing the ladder.
Netdecking has been incredibly useful for building my own decks, now, because I learned to ruthlessly evaluate every card and think of them in the context of the meta.