Sorry, but I highly disagree. Let's look at varying instances of stone usage:
The one everyone loves to talk about, max lvl zeus, +297, used all stones on stamina recovery. Why was he able to do this? He rerolled several times, acquired the monsters he was looking for to build a Zeus team from the start. Once he had those monsters, he had absolutely zero need for using stones on anything aside from maxing out his team. A valkyrie segways extremely well into zeus. Several players that played the JP version of the game made their team choices from the start of the game, knowing they'd be working strictly on a zeus team and skipping things such as legendary/master dragon runs, so they could be ready to smash them with a maxed out zeus team when the time came. Most of us didn't even know Zeus existed back then. He's a bad example to use compared to general players.
Reasons for rerolling: Well, I always like to advocate the following 2 strategies in this game. One is attrition, slicing something's health down slowly, while being rather hard to kill (ie; using 2 resist dragons, odin + a healer, etc) Or option 2: Kill it before it kills you.
Let's look at 2 examples of teams against something like Hera. You could go in with CDD + Odin, rainbow keeper, 2 maxed sirens and lilith, and take 3 and a half hours. You could go in with a 2 parvati team and beat the dungeon within 10 minutes. Which is more desirable? Option 2.
Let's look at your choices for option 2, if you don't start with a particular leader. You could run an ADK team (farmable, glass cannon type team, not that safe, relies on echidna) You could farm a dark team (vampire leader, can run with a loki friend)
These are realistically the only two farmable teams at the moment - the best you can do outside of this, is a 2x damage multiplier. (starter dragons, mechs)
Teams with a 2x damage/Rcv or 1.5x rcv atk hp X2 have a significant lead, can carry your team into end game, and if you get one off the bat, you aren't relying on luck to acquire it later. In my 30ish rare stone pulls, I have yet to receive one of these types of gods, rolling on 2 different godfests. It's a pain, and if I were to get something like a freyr or lakshmi now, which have the possibility to formulate a stronger team than my ADK team? Well, i spent all of my resources on green/dark monsters which have no place on a blue or red team.
I'd really strongly suggest rerolling, while it's more painful now, it'll make the rest of your experience much easier than if you hadn't done it.
My 2 cents.