first of all, Steinberg products are awesome, and I use Cubase Pro and Dorico as my main softwares as of now.
After reading Daniel’s comment, I had to actually create an account here and contribute.
no matter how slashes were invented and used historically, slashes are MUST HAVE tool in genre using lead sheets like jazz and pop.
I love Dorico over Finale for its features, performance, and ease-of-use, etc…
However, not having good slash options actually makes me go back to use Finale EVERY TIME I need a jazz chart or pop lead sheet for quick rehearsals.
This is actually a DEAL BREAKER for quiet many people I believe. I was hoping to be full-time Dorico user, but now I am forced to go back to Finale, which I wish not to.
I wanted to post this, so Steinberg actually takes this seriously and improve on Dorico’s features in making charts and lead sheets in popular genre.
I cannot wait for Dorico to implement this, so I can be full-time on Dorico.
Also, I would like to see more staff choices. I just do not want to see grand staff all the time for the piano. Also, I sometimes want grand staff for horns, and I just cannot do that on the fly. I know we can create another instrument track and change the names, but that is not so intuitive, I think.
Not to mention, nice integration with Cubase. (I don’t exactly know how, but i’m sure everything is wishing for this integration 
)
But overall, Dorico is such a great product, and I still think it is the best. just got some rooms to grow since it’s the youngest in the market.