As someone who’s interested in advancing research on second language acquisition to help people better learn languages, I think that a careful and rigorous scientific approach is tremendously important.
Good research of lasting value involves carefully planned studies and experiments that require the investment of a lot of time, money, and human resources—not things that can be thrown together on a whim.
At the same time, I think there’s enormous value in also being able to research and experiment in a much more informal way: through unbounded play with language acquisition.
The ability to try out many things spontaneously can help us break away from preconceived notions and generate new insights, and this can ultimately lead to better research questions and better formal studies.