because beyond the GPU does not suck memory I don't see any advantages for the system.
To make a very slight argument for a GT710, it could add display outs, more display outs or legacy display.
Some high-end Z490 boards have no display outs at all onboard (Maximus XII Extreme, for example), others have minimum (like the single HDMI on the Z490 Phantom Gaming) or multiple that are digital only (HDMI + DP on the Z490-E Gaming).
So, a GT710 would allow you to add VGA or DVI, or even just to give you a basic display out... Depending on the board.
Mostly though, it'll be marketing and capitalizing on a lack of knowledge. A discrete GPU, regardless of what it is, will always sound better than "onboard graphics" or "integrated graphics" to anybody who is not very familiar with modern tech.