Adobe updater - value of progress bar with unknown number of processes?

[ungua]

everytime my acrobat reader updates i get more than averagely annoyed by the progress bar. it moves from 0 to 100% maybe 30 times, but it is impossible to know how many processes have to be done. so what it is the freaking point of a progress bar then? they could as well show as a dancing clown, i would much rather appreciate that.