The choice of a single film and developer combination is not a capricious one. It was advocated by Ansel Adams in his book The Negative. Once one fully understand a particular combination THEN a second combination can be tried. Trying to juggle two films at the same time will only lead to problems.
I understand the premise. I am saying I disagree with it.
A beginner will learn more about a film and about tonality and characteristics if he starts with two and contrasts one against another.