Disagree, in supersonic aero, the tip is more important for accuracy, the base for drap performance. Yes, that is how they are made, but while it's possible to make a precision point as part of the mfg process, or in aftermarket, there is a reason they make, sell, and precision shooters use meplat trimmers and don't fuss with the base...a precision tip (flat or point) is far more important for accuracy, even if the associated slightly larger tip negatively affects BC. So, yes, you are correct that it is a side effect of the mfg process, but the same process can be used to create a point (and people have done so), but it is much more difficult to form (and maintain) a precise point than a flat, so for precision (consistency), a meplat (flat) tip is what is used. Some mfg (lapua) go to the expense of even trimming/forming the meplat in a secondary operation IIRC just for this purpose. With lathe turned monometal bullets, obtaining a symmetric tip can be dome at effectively no cost to the mfg, so that is why it's done there--while not nearly as much attention is given to the base.
The reason is, side force at supersonic speeds is largely driven by the shock interation, and the angle ofnthe nose shock to the body is fixed at a given speed/atmospheric parameter, so if the tip is asymmetric relative to the centerline, the shock come will be tilted, and with the spin on the bullet, will cause a side force that rotates with the bullet, resulting in an ever-widening spiral. I can tell you based on actual experiment that this is absolutely observable when I've compared bullets with near-perfect meplats vs those with even slight variations.
So it comes down to cost...it is possible to create a sharp tip on a drawn jacket, however, the cost of the additional operation would likely double the cost of an already expensive bullet, which, for the long range, large caliber projectiles it would be mainly advantageous for, would put the price roughly equal to lathe turned bullets (e.g. $0.50-0.70 for drawn 338 increasing to $1.2-1.4, which is the price of lathe turned 338)
So it's really a yes and no.
A perfect boat tail isn't to avoid muzzle deflection, (while it does help), it's to approximate a rear low drag profile without a full sears-haack (optimum area rule) shape (the best boat tails are a 10-20% length cut-off S-H shape for drag considerations and to avoid mid-body shocks.
