There's no "second" Soft Cap, there's one Soft Cap period. Hard Cap = Full stop on stat gains. Soft Cap = severely diminished returns and no real meaningful progression past that point. 26-50 is extremely meaningful and useful and is just a minor decrease in returns, depending on the Stat.
Vitality all the way to 50 is pretty great. Strength and Skill all the way to 50 depends on your weapons scaling stats but is generally good to great. Bloodtinge to 50 is huge for Chikage and of debatable usefulness for Guns. Endurance all the way to 40 is Fantastic.
Arcane scaling is extremely bad for the weapons with built in Arcane Damage. Even with 50 Arcane the Blade of Mercy, Burial Blade, Logarius' Wheel, and Tonitrus only get +25-35 Bonus ATK from it. And, purely from a numbers standpoint, the Arcane scaling on weapons that you convert to pure Arcane/Bolt/Fire with Gems gives you some awful numbers compared to the Physical Scaling they get from Strength and Skill combined when comparing stats all at 50. Though I guess there's some cases to be made for the weird low level PVP meta crap.