I will push back a bit and say that the arrogance of current and past scientists and engineers mostly comes across in dealing with them personally and, for the most part, they try to put their egos to the side to better communicate their ideas. Wolfram puts his ego front and center in his more recent scientific communications (the CA collected papers didn't have this problem, as far as I can remember). It's been a while since I looked at ANKoS but, as I remember, the scientific ideas are intertwined with his editorializing. The editorializing gets in the way of understanding what actual fundamental scientific ideas he's trying to push forward.
Could this be a function of the eras' SNRs? When the principal mode of public and scientific discourse was curated print media and letters, one needed only so much pomp to decide you could deduce something grand about the world, and then upon having deduced it, convince your peers that you had in fact done so. In our modern era, to attract people and funding and attention, something more extreme may be needed. (Very, very loose hypothesis. It's probably just a personality thing.)
Not making a comparison in terms of contributions to science. But the same could be said about Newton and a host of other great (mostly) men of history.
One of the most useful emotional filters I've learned to drop is the predisposition against zealous enthusiasm. Automatically dismissing it is as reductive as immediately submitting to it.