Except it's not. I don't know why you said speed tying starmie isn't a big deal when you risk a scald burn and 30% chunked off. LO starmie does almost 75 % with hydro pump and you said "it can't do much". Torn t will slaughter you with superpower or focus blast, one of which it always carries, and weavile, an increasingly present mon slays you with low kick. Forget the bisharp stuff, there is absolutely no reason to forgo outspeeding numerous threats that can 1 or 2 hko you for a minimal and often unnecessary increase in power.
Go look at usage stats in the higher rankings. Nobody goes Adamant because it's straight up lame to still be slower than stuff even at +1. Run jolly, period.
You seem actually angry. Calm down, this is a video game for children.
Adamant lets TTar OHKO 64 HP Mega Altaria with Stone Edge / Ice Punch without rocks.
It gets it a OHKO on max HP Azumarill with Stone Edge without SR.
Crunch can now guarantee a OHKO on Bold Celebi with rocks, and usually do so even without.
Stone Edge guarantees a 2HKO on all Clefable, even Unaware. Jolly has a chance of only 3HKOing.
Diancie is OHKOed by +1 Adamant Stone Edge, while TTar needs to run EQ to OHKO it if it is Jolly.
Dragonite is OHKOed by Stone Edge and Ice Punch through Multiscale with Adamant, but survives 40% of the time against Jolly.
Adamant Ice Punch OHKOs Yache Garchomp while Jolly does only 6% of the time.
Stone Edge has a 37% chance to OHKO Mega Gyarados, but zero to KO when Jolly.
4 HP Heatran is KOed in one hit by +1 Adamant Stone Edge about 70% of the time, but never when it is Jolly. 252 HP Heatran has a chance to be OHKOed after SR by Stone Edge but never when Jolly.
Phys def Hippowdon is almost always 2HKOed by Ice Punch when Adamant but only 25% of the time when Jolly.
Adamant OHKOs Phys def Landorus with Ice Punch at +1 and OHKOs Scarf Landorus on the switch in at +0. Jolly can do neither without prior damage.
96 HP Manaphy is virtually guaranteed the OHKO by +1Stone Edge after rocks when Adamant, but dies less than half the time to Jolly.
Stone Edge guarantees the OHKO after rocks on Mega Manectric after Intimidate, Jolly does not (not that this matters lol, Manectric does 30% max back with Tbolt).
Crunch OHKOs Phys Def Mew when Adamant but not always when Jolly.
Adamant 2HKOs Mega Scizor with +1 Stone Edge and can 2HKO with Crunch after rocks. Jolly needs SR for Stone Edge to 2HKO and has a very low chance of doing the same with Crunch.
+1 Crunch usually 2HKOs Skarmory after SR when Adamant but Jolly has to rely on Stone Edge hitting.
Adamant +1 Crunch can OHKO Slowbro after SR. Jolly can't.
Stone Edge can OHKO max def Sylveon when Adamant, but never when Jolly.
+1 Adamant EQ OHKOs max HP Tyranitar but Jolly needs Stealth Rocks.
I don't doubt that Jolly is more reliable but don't blow off extra power on a sweeper.