You are probably right.
I use sheet music primarily to correct the online lead sheets for the ukulele groups I run and supply the music for. Like online bass tab sources, some of the lead sheets online are just plain wrong.
I also find sheet music invaluable for times when someone wants a lead sheet for a song that I do not know. I find that sheet music provides the missing element of rhythm that tabs and lead sheets do not usually provide. Also, if you want to write your own improv solo(s) for a song sheet music is helpful.