GMforPowergamers
Legend
Point out to him that, since the point-buy method AND the stat array method both have a max possible score of 15 (before racial adjustments), that is how the game is designed. If he balks, tell him it is too much trouble for you to similarly boost the stats and powers of every monster and NPC to similar levels, so to save time you'll just give the monsters an additional +5 to every roll you make for them, including hp/HD.
I did try to point out the 15 being the high thing (although not with the +5 threat) but he truly believes that 5e is 100x deadlier then 4e and that it is a rocket tag game... he who hits first wins. So he wants really high Con and a high to hit...
one of his other points was that it is not uncommon to see saves at DC 15, witch to have a 50/50 shot of you need a 20 stat. So he thinks any stat below 14 is a major flaw...