…have you seen the modern spongebob? It is the exact opposite of steven universe- poor pacing, no understanding of how to use its charcters or keep them likable, gross out humor that fails at even that, rehashing of plots, and just general death of creativity.

Uncle Grandpa worked well since it is fast paced, allowing you to moveto the next joke ebfore the last overstayed its welcome, and it brings enough surprises and 4th wall breaking in jokes to make it work. At least as a one off cross over.

Season 1-3 Spongebob though? Sure, maybe have them crossover with Malachite for a magical adventure.

No, you see, since your body can no longer produce tears, now you will cry blood.
Have fun at the hospital when you get your blood transfusion!