Yeah, I'm absolutely not defending the 5060 Ti 8GB here (the card shouldn't exist), but the customer you describe is real and I know a couple. They're the type who by some metrics would count as "hardcore PC gamers" because they spend a lot of time gaming on PC, but who also know very little about the hardware side and almost exclusively play one or two older games (Counter-Strike and League of Legends are the obvious ones, though Fortnite probably belongs there as well). Steam stats showing most users are playing games over 5 years old is a big market.
And yes, when their GPU conks out, they tend to go and buy the cheapest "new" GPU on the market, which right now may mean the 5060 Ti 8GB. On one level, that makes me cringe because they are buying an obsolete-at-launch product. On the other hand... chances are that in 5 years time, they'll still only be playing Counter-Strike or League of Legends and will never have been anywhere near the VRAM limit.
Slightly hilariously, the guy who bought my old 4090 almost exclusively plays Counter-Strike and took a fair bit of persuading to move from 1080p to 1440p.