Shoes salespeople wield huge influence over buying decisions, especially if they come off as authoritative.
My son works in a running shoe store that also does gait analysis and they default every new runner into something stable-neutral like a Brooks Ghost, Saucony Ride, or NB 880. They never default with Nike or Adidas because, although both brands make some excellent running shoe models, neither have anything that's in the same category (if Nike had a shoe that was a mix between the Structure & Pegasus, that would be id. If Adidas had something like the SL2 but with a little more structure, that would, too.). The problem with both Nike & Adidas is that they cater to a million different niche audiences, and while both have some amazing running shoe options at the top end (e.g. Vomero Plus for cushioned daily, Alphafly / Streakfly / Vaporfly for racing, etc) their shoes targeting casual runners doing 2-5mi slow runs a couple days a week are lacking. Yes, you could go with a Pegasus, and many do, but although that's a general purpose stable-neutral running shoe, there are way better options from other brands (including Hoka & On, but also Brooks, NB, Saucony, Asics, Topo, Altra, Mizuno, and more).