i've seen multiple videos of folks solo'ing radahn: no summons, no horseback even. i saw one dude solo radahn 100% melee. i ran that entire fight, spamming summons, lightning rods, FP potions and then arrows when i was out of potions. but hey.
the game is meant to played the way you want to play it. and if you want to invest the hours it takes to get THAT good... more power to you.
also... from software basically birthed git gud. i dont think they're laughing at fans embracing these challenges, just because you dont see the logic in it. it's what their brand was built on. and please believe when i play through again i'm fighting every boss straight up. same way i cheesed demon of hatred my first playthrough and then spent hours learning how to beat him straight up.