To be fair, in Caesar's case, that may be because of the fact that he doesn't have any real industrial base. Raul points out that the states Caesar ruled were almost completely tribal in nature.
It's actually amazing the Legion is as well armed as it is given this.
truth, by all accounts it would seem all the tribes the Legion formed from and then subsequently absorbed were all at the same low tech level. Perhaps Caesar uses the low tech level not only as a philosophical unifier of the tribes of the Legion or as a method of control to keep some tribes who objected to their assimilation from using advanced technology and "liberating" themselves, thus keeping himself at the top and in control. Which leads one to wonder if Caesar truly feels his method of governance is better than the Republic he's trying to destroy or if he's merely a megalomaniac who holds a stranglehold on the control of the Legion for his own ends?
in either case, I feel Caesar's objection to technology on the grounds of that it weakened humanity and brought the nuclear holocaust is another example of either ignorance of some aspects of Roman culture or just revisionist history on the part of Caesar. Both the Roman Republic and Imperial Rome dominated the rest of the known world in technology and its application. If he truly wanted to emulate Rome he would be much more accepting of that fact.
But that's a topic for another thread

back on topic, the Brotherhood of Steel is a liability to any faction in question (be in Independent New Vegas, the NCR, Mister House, or the Legion) if the goal is to transform NV into a functioning state. They would constantly be a hinderance to the promulgation of tecnology and could not be bothered to uphold justice or rule of law in the Mojave, especially if it went counter to their beliefs. Looking beyond having their assistance in the final battle, it would seem that the only prudent, long-term, solution in the best interest of New Vegas for the Brotherhood is destroying the Mojave Chapter
Fratrum Delenda Est