I feel the Markup system could use a revamp too. The biggest thing I wish it had is curved arrows. From twisting an EPO, throwing a lever, or just closing a door, a curved arrow would be so much more elegant than what we can do.
Personally, I’m indecisive about text on images. On one hand I can see the use for certain people, but on the other hand, text on images can be a messy problem (hard to read, too small on certain screens/devices, etc.).