Drawing lines would be great, but this improvement is much easier:
If we just subtract all the “own” stones and dead stones (and add any prisoners - thanks @benjito), we arrive at something that looks like a Japanese score.
Yes, unfortunately it doesn’t reflect any possible continuation, especially since there’s no way for black to hold the territory at A4. But maybe that’s the kind of mistake you should expect from the weak SE anyway?
It’s very predictably wrong for handicap games, and similarly any game with a lot of early passes:
But more commonly it’s frustrating for it to be off by one in a normal even game, whenever black plays last:
Also, doesn’t it just look wrong to have all those area points marked as territory?