GnomeWorks
Adventurer
And see, this is why having the context of why this was being done is important.Nope, the intent is to provide a way for characters that wouldn't normally get the Extra Attack feature to get it, and without having to multiclass.
The thing is, I really don't like the way that multiclassing works in 5E, so I'm looking for other ways to mix-and-match class features. Feats were a logical first place to start.
If the overall goal is to have pseudo-multiclassing by using feats, why not take an approach similar to how 4e handled it in heroic tier?
So instead of having a generic extra attack feat -- well, you might still need it, but I'm not sure -- have a feat chain for each class, giving you more and more of their stuff. So the fighter chain might start with +1 STR and action surge, then go to +1 STR and extra attack (limit 2), then +1 CON and indomitable (one use). Give them 4th, 8th, and 12th level prereqs, and that ensures that the pseudo-MCing characters don't get iconic stuff before the real deal, and limit them a bit more than the real deal, and that should get the "feel" of multiclassing.