I agree with your motives for soloing, but I am most confused - you make it sound like there wasn't any soloable post-50 content?! What was I playing with Tigerbaby, then, to earn him his Empyrean Merit nyan-cat rainbow-butt aura and all those nifty Incarnate powers and level shift?(NB: River of Dreams is the ice/storm Controller TB teamed up with most often.)
There wasn't until Dark Astoria, no. Grinding out pre-50 missions for Shards that never seemed to drop doesn't count. Dark Astoria was the first step forward, and I assume many more would have come, had the game been given time. Beladonna Vetrano's mission was a good example.
Why I seem critical, however, is because many of the Dark Astoria missions were balanced for ridiculous difficulty. And no, it's not just that "Incarnates are supposed to be stronger." How do I GET stronger when the only content to do that in expects me to be stronger already? Expects me to be using complex intricate Inventions builds for defence cap? Even at the best of times, I could only ever play the Incarnate game with any degree of comfort with only a select few powersets. Super Reflexes? Not without piling a ton of Inventions defences on top. And even then, I got run through the ringer.
And it's not "just" difficulty. It's also the practice of spawning HUUUGE spawns on top of me, or sending multiple spawns to fight me at the same time. That "Defend the Midnight Mansion" mission with the four Elite Bosses is just absurd, and I felt like slapping whoever designed it upside the head... And that's not even Incarnate content.
It's not Dark Astoria's fault. The developers simply assumed I was a lot stronger at one point, and started making the game much, much harder on my old difficulty, all the while rewarding me not much more for it. I'm fine with people wanting their game to be challenging, but that's what the difficulty slider was for. What it WASN'T for is spawning x4 spawns in my missions set to x2. What it WASN'T for is spwaning +3 enemies in missions set to -1 (keep trucking, Tub Chi). Somewhere along the line, the whole game got far too difficult for me to play and still enjoy it, to be quite honest.
But here's the catch - in regular content, I could always stick to the old 2004 missions that had ordinary spawns, didn't have ten ambushes every time I sneeze, didn't have multiple huge spawns, didn't have four elite bosses at a time. I could stick to the old content that was easy... But for Incarnates, there WASN'T any old content. It was all new stuff designed for much stronger characters than I had.
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The thing with solo play isn't just what "possible" to run solo. It's technically possible to solo AVs and Giant Monsters. It's what I can solo and actually have fun doing it, and much of the game started getting uncomfortably brutal towards the end. There's a reason I stopped playing Blasters altogether - boy that was stressful to play. But towards the end, I was considering dropping entire powersets from the ATs I liked, such a SR, Energy Aura and so on. They were a right pain to play in Incarnate content.