With the current tax law, it seems that yes, for your current situation, a taxable will work out to be better under some assumptions.
But keep in mind that the 0% LTCG bracket is relatively new. And this is subject to change at any time.
Roth and Traditional retirement accounts, however, are a political guarantee. Sure, the US government could decide to change the rules at any point in time - oh you have to wait to 65 now, or actually Roth withdrawals will be subject to tax.
But to make changes to these rules, which are effectively a political promise, would take a massive amount of political maneuvering to the point where I consider the probability of this occurring to be lower than that of me dying before 59.5 (for context, I'm 24). Furthermore, the more money that ends up in these accounts, the safer they are from political change.