This is true but you get used to it. If it's a factory or forgiving clutch, then you'll be right. No fun to be had in autos really.
Autos are designed to be more efficient and economical. I know that in mine, if I'm in D, the car isn't willing to stay about 2.5k rpm even when I'm hammering it. Eg: going around a corner pretty hard, you lift and the revs drop right down as it will automatically select the most economical gear. Whereas in tip, the TCU switches to sports mode and allows a lot more free revving. Don't know if the older manuals had this option. Also, if it isn't tip, how are you going to chose the right gear? If you're in traffic and want to give it a bootful around someone at 60kmph, the box will have you in 4th and you won't have the torque there. Just saying, that if you plan on building the car in the future, get as many things right now as possible as parts cost cash. You could be paying up to $1k for a decent RB25 manual box whereas buying a manual now may only cost an additional $300-$500. f**k with it, learn to drive it, destroy the clutch and replace it. You'll still be better off financially.
Don't get me wrong. Autos are great but if you want performance, it should be a manual or a very smart auto box.