How come there's so much negativity towards Shibuya and Shinjuku on this sub?

Browsing around this sub, I typically see some very dismissive attitudes towards Shibuya and Shinjuku with people telling newcomers to avoid going to or staying there. Having been to Tokyo multiple times and spending a lot of time in pretty much every single neighbourhood, I still feel like Shibuya and Shinjuku rank near the top for me in terms of the best places in the city to spend time in.

Even setting aside the fact that they have an endless number of cool bars, pubs, restaurants, stores, points of interest etc., they are pretty much the ultimate example of truly urban Tokyo in terms of vibes and energy. Like yeah they're touristy, but you're a tourist and you will be no matter where in the city you go. This also seems very much like a Reddit phenomenon - I know a lot of people that have visited Tokyo in recent years and pretty much everyone has loved both these areas.

So how come Shibuya and Shinjuku get so much negative press on here?