Yes, because currently, and in the last 30-odd years, our history is incredibly poor. We've barely hung on to our premiership status a few times, and most fans, to be quite honest here, don't give a rats arse about history, and only teams who haven't won anything in years keep banging on about it. The RS do it every single time anyone mentions a title too, despite the fact I hate myself a bit for that comparison.
Don't get me wrong, I'm proud of our history, we WERE a great club, but therein lies the problem - 'were'. Should Koeman go to Villa then, seeing as their history is better than Saints'? Or Preston, or Wolves? No, no he won't, because in most cases managers want to build for the future, not for the history of the club, and those two clubs have nothing to offer and are quite on the low right now. As things stand, ours is more or less uncertain and, despite the money, we'd be a massive rebuilding job - why would Koeman, in his right mind, get away from finally perhaps having a stable team with Southampton (and also possibly being in Europe), and then coming here only to have to re-do it? That's what I mean that it's a side step at best, as he'd go from top 6 Southampton to possibly top 6 Everton (and that'd be up to him and his buys). Different for a manager with no job currently, and nearly any club would be a step backwards for Mourinho, I still doubt we'd get him, but part of me hopes...
Our history should be a motivation of sorts to managers - to bring us back to the glory days - but our recent history (read: the last 25 years we've not had any silverware other than the Everton cup which we got for playing Everton) doesn't exactly show anything exciting, does it? Top 5 a few times, top 7 most the recent times, several seasons in the bottom half, several dances with relegation, two great escapes, one FA cup final and a few semi finals.
Southampton's history is poorer than ours, but does that mean they're currently doing worse than us? Nope. That's more or less what the lad said too, but because he had the word 'history' somewhere in his post - people stuck to that and called him deluded.