Look, being positive is good, but how could prayers getting rule of one'd not make you pessimistic??? The last think Khorne needs is another nerf! If you did want to build a list around generating blood tithe then taking Blood Sacrifice more then once would be crucial. Yes there are a few artifacts that can generate blood tithe in certain situations but then you are missing out on the damage dealing capabilities of things like the Crimson Crown or Death Dealer which are greatly needed to buff our units or Heroes. Not to mention the Brazen Rune is pretty much mandatory in the new magic heavy meta so thats one artifact slot permanently locked up. And it means we will pretty much never consider the new realm specific artifacts as we are forced to take specific artifacts from our own allegiance just to make our already mediocre allegiance ability functional... thats pretty broken design from Khorne's perspective.
Its nice that virtually none of our heros need to be the general to use their command abilities, however if taking Skarr & Karanak is mandatory, and you also run a maxed out gore pilgrims with 3 priests and a bloodsecrator, then none of your heroes would have a command ability anyway...
Even without gore pilgrims you will still want a bloodsecrator and at least one slaughter priest for unbinding if nothing else. Including Skarr and Karanac still only leaves you with 2 hero slots for about 10 viable choices. Even then, if you go for a bloodstoker or an allied wizard or Cygor, you still might only end up with one Hero with a command ability. Once per battle we might use an extra command point to ensure an auto run of 6 or to reroll a charge... whoopy do...
As for summoning, if you somehow manage to bank the points without using any of the original blood tithe abilities (good luck not needing spell eater curse in the first few turns), bringing in a bloodthirster is nothing to sneeze at. However its likely to not occur until turn 4 and with the charge likely to fail, the summoned unit has one turn to do something. Considering you wont have any blood tithe to start the game and prior to summoning a bloodthirster you have probably not spent any bloodtithe in turns 2 & 3, our allegiance ability brings us absolutely zero benefit for 60% of the game.
I admire you for staying positive but perhaps you haven't fully considered all of the implications the new edition brings? Yes all the tools are there for Khorne to be competitive, however the in built limitations of the game and our allegiance ability mean we can't ever access all of the tools at once and therefore will struggle to compete.