Isn't Reyna's ult pointless with 1 opponent. I always used ult in the beginning of the round as Reyna. Am I missing some new advantage or they just noobs?

We were in agent selection, I went in picking Reyna and this guy said, please let me go reyna I'm good with her, I told him okay dude I Will go sage, so I picked Sage and we started playing, he quitted After 15 rounds with score 2K 0A 15D....

I'd be considered low Immo, stuck between Immo 1 and 2 with a 139rr peak (EU servers) I'm really trying to get better and I know I have the right mindset for it, but high immortal seems to be way above my level as expected, I'm curious...