Because becoming strong is not in their ideals.
Let me list a bunch of games that did this shit and pissed me off.
Dragon's Dogma Dark Arisen.
In the original Dragon's Dogma, there were "God builds" that made you unstoppable with extreme risk. The most famous one was the Nightstalker Build, ie, no pawns, travel at night only, stay in critical health the entire time, cast buff magic and you could deal Millions of damage in a single hit but run the chance of dying in a single hit. Other issues? This build required severe minmaxing, meaning you were not doing this by accident nor were you doing it on your first ,second or third run of the game. It was truly rewarding to be completely destroy things that could still destroy you if you made a single mistake.
tl;dr up to 50x more damage in exchange for dying in one hit and there were still enemies completely immune to physical damage so you really had to be a dodging master and good with throwing items to even stand a chance.
In Dark Arisen, they changed the items of this build to be additive rather than multiplicative, which in turn rendered a whole bunch of buffs absolutely worthless. Like how the fuck is +2 damage equal to x2 damage - - but the requirements for the build were the same. You still died in one hit but now your damage output was so pitifully low you could run anything else. Essentially punishing anyone who was dedicated enough to do this.
Another example.
Dark Souls , 1.03
Crystal Ring Butterfly Shield / Pyromancy / Magic / etc.
Before they fucked up the game in favor of PVP, very few items could get you through NG+7.
Then they decided to re balance everything for PVP, not taking any fucking consideration for people who only played in PvE.
And then the faggots behind Darkest Dungeon.
>People come up with optimum builds because the Final Levels are bullshit.
>Devs nerf the optimum builds because you should not be rewarded for doing good.
>Devs then release DLC with slightly overpowered items.
>They then nerf the BASE GAME because the DLC items are too strong and break the balance of the base game.
>People who do not have the DLC got nerfed for no reason.
Oh and then Metal Gear Online.
>Infiltrators get nerfed heavily because High Risk, High Reward was too rewarding.
>NV3 is still overpowered and still shits on Infilitrators.
>One of the nerfs included LESS hitpoints for a class that only had reduced HP.
>Class soon became All Risk, No Reward.
>Enforcers got their ability to break up clusters of enemies nerfed.
>Scouts got the tranq rifle nerfed, which in turn ruined the playstyle of people who actually helped their teams in Bounty Hunter.
One more game. GTA Online, at Launch in 2013
>Missions barely paid money.
>Everyone played the same missions over and over and over to gain cash and upgrades.
>Devs nerfed the payout of the missions.
>People figured out how to defeat Survival.
>Devs eventually nerfed money gain.
>Made Survival nearly impossible to win on some levels.
>Gaining money rapidly will ruin the ingame economy! Said the devs.
But there was no economy in the game. You couldn't buy or sell anything to other players, so what economy was having a lot of easily accessible money ruining?
2 years later PC launch.
>Money gain is an absolute fucking joke.
>WHY NOT BUY A SHARK CARD
>Tired of grinding? How about buying a shark card?