That is horseshit anecdotal evidence too. Dude, it took all of three quick data points to confirm it last week. I must have killed over 70 hobgoblins in the pre patch solo with my 300 damage arc sniper with crit hits, always one shot. I saw people post about it on reddit, I jumped in the nightfall with my exact load out, crit shot hobgoblin...hmm definitely a sliver of health left. Maybe I fucked up, another crit hit, same thing. Even though I was in the exact same cover spot, I even moved forward to assure it wasn't a range issue. Nope, it was definitely no longer a one shot kill post-patch. Sure I can switch to my primary and finish them off without wasting sniper ammo, but they most certainly changed the solo balance. I am not saying it is harder as in, ohh no I am not l33t enough to solo anymore! Still did it this week, they just managed to make yet another thing in this game more tedious at the expense of fun.
I used all arc last week and this week and soloing is fine, but it did change. Now things went from 1 shots to 2 shots, and 3 shots to 5 shots depending on the enemy with the ~10% solo scale up. Bosses, even more so. Does this break nightfall? Nope, but when juggler on, those bullets matter, and it is just more time dicking around with ammo packs. I just see no reason why they needed to do that.