I have a hypothesis that their target demos are both women and people who have a hard cap at a couple thousand for a luxury watch (not mutually exclusive).
Since they're both under the Swatch Group, Longines will always be positioned under Omega price wise to avoid market overlap. Outside of maybe the Legend Diver, they don't have a super unique men's watch that get would get buzz in online communities or youtube videos. It's not that they're bad, but skimming through nearly every watch reminds me of another brand.
Their women's line is a bit bolder and the Mini Dolce Vita appears to be a hit for them. It looks like they've focused their marketing a more in that direction too with Jennifer Lawrence and Kate Winslet as ambassadors. They have somewhat famous male counterparts, but not ultra accomplished household names like those two.
I googled around and in general it seems the top watch brands are Rolex and Apple Watches (by far the leaders), Cartier, Seiko, Casio, Citizen, Omega, Fossil, Titan, Tissot, and generally closer to the bottom but still very well selling Longines. If you look at the price points, there's a clear delineation. Greater than $5k watches (Rolex, Omega, Cartier) and less than $1k watches (Apple, Seiko, Casio, Citizen, Fossil, Titan, and mostly Tissot). Longines occupies this $1k-$5k space. I imagine the average person looks at their Conquest/Hydroconquest lines and thinks "alright, that sort of looks like a Rolex, it's better than those cheap watches but I'm not spending a crazy amount".
For vocal watch people, there's more interesting looking watches at lower price points with Seikos and microbrands and etc. Then on the other side, instead of paying $2500-$4500 for a Spirit Flyback/Master Collection, why not just get a watch like a Speedmaster at that price point which has more "history" and quite honestly just clout/marketing behind it where it's a conversation starter. So I do agree their price point is sort of a steal, but only for a silent majority who are getting a similar design to more expensive watches at a lower price point. But a watch nerd is less likely to want to settle, at which point the price just doesn't make as much sense.
I would get a smaller version for your wrist. The Tank overall is a great watch. You're not buying it for the movement, you're buying it for the unique look and classic style. The original GOAT Muhammad Ali wore a Tank. Warren Beatty, JFK, Steve McQueen, Clark Gable all wore small tanks. Watches have obviously trended bigger over the years but historically masculine celebrities haven't had any issue wearing smaller Cartiers. On the other hand, if you don't feel confident you can style it with the rest of your look I don't think it goes with everything. At the end of the day the watch is only good if you like it.