I guess so.. It's been so long since "legendary" was introduced I really can't remember how I played before it. There's really no way to waste points in legendary. "Oh no, I'm out of points, guess i'll go craft some stuff."
Edit: forgot to say that I was commenting on required stats and perks for quests in that last post. Skyrim never really locked you out of quests because you didn't have a perk, skill or stat. The only thing I can remember were the mage spells.. Fallout has (in the past at least) had a butt load of events that you can't do unless a skill or stat is at the right level to unlock that quest. Don't have science up to 50?.. oh, well, can't have that conversation and get that quest. .. That's what I meant when I said it can be used in a cheaty manner ( if that system still holds for F4. )
Example: You're level 32, you've saved up 12 points because you're saving them for your actual character build... but then you come across a mission that requires a science perk level of 3. You learn that this mission unlocks a major uber weapon.. but you weren't buidling a scientist. However, it would only take you 9 points to get there. The temptation now is .. stick with your character build or unlock what you need to to get that mega uber weapon.