I think it would be exceedingly rad if there were TWO ultimate upgrades, for each ultimate ability a hero gets. Sounds crazy right? Just hear me out.
One of the majorly cool innovations of this game compared to other mobas is the ability to customize what ult your hero chooses. It's a special tier of talents at level 10, and it radically changes how your hero plays. But talents at level 20, by and large, feel pretty lackluster. You basically have two choices: buff your ult (if the talent is even good), or take one of the stock "of the storm" upgrades. I'm not knocking those upgrades really, they just don't feel that special as a last talent upgrade path.
How cool would it be if you could FURTHER customize your ult as a final level 20 upgrade choice? What if Sonya doesn't want to create an arreat crater, but instead her leap could (as an example) do a double bounce? What if Hammer doesn't want orbital rockets, but instead wants it to be able to re-activate for an explosion?
Level 20 is the LAST upgrade choice we have in each game. That choice should feel impactful. As it stands, you can certainly FEEL the power increase upon reaching lv20 (especially first). It just doesn't feel that unique to whatever talent spec you are going for, and as such is kind of a bummer.
Thanks for reading!
TLDR: Please consider adding TWO level twenty talent upgrades for your ultimate ability. We need more interesting talent options at this supreme tier!