Building a story through sketches.

I have undertaken the practice of writing at least one page of a script each day this year. It is a challenging thing to do on a very basic level. It forces me to stretch my imagination in such different ways than I have done in the past. I would like to use it to write a full-length feature, however, and while I think it can definitely serve that purpose I am starting to realize new challenges it creates in the style of how I would normally write a very lengthy script. Namely, that each day is such a rough explosion of ideas(maybe explosion is too generous... mini-burst?) that I wonder how helpful it is to build a story this way. I would normally be inclined to sketch the overall story arc first before building the whole thing up by adding polished pieces onto that story arc skeleton, so to speak. I wonder if this new method will be something that is ultimately more frustrating to the process or more of a blessing? It feels like it kinda has to go one way or the other, strangely.