As Sergey Balandin said in the closing of the conference, there are directions for further improvement of the FRUCT conference.
I personally prefer to see abstracts/papers and slides in advance. It helps a lot in understanding the results that authors present in their talks. It also helps in decision what section to attend. This info can be published at the web together with the program. Even if your slides are not final it forms preliminary imagination about the talk. Clearly, final versions of slides can be published afterward.