Maxperson
Morkus from Orkus
You keep repeating that like it's true. It's not.
I repeat it because it's factually true. Your denials can't change facts.
In THAT system, the full range of PC stats is 8-15.
There is no "that system". 5e only has one system, and that system is to roll 4d6-L or choose an array if you don't want to roll. At the DMs option, point buy can be added to the rolling and array system. Choosing the array or point doesn't eliminate rolling as part of the system, so the full range of stats for a PC is 3-20 after racial adjustments.
Again, you have no ability to make realism not the issue.but, again, that isn't a realism issue, it's a personal taste one.
It is no more realistic that a 1st level PC has a max cap of 20 (after racial bonuses) or 17.
Again, that's completely false. Random is more realistic than point buy or array, as you can't control what stats you get in real life. In real life you have the full range of possible stats available to you, unlike point buy or array. It will always be more realistic to roll.