I do understand that slide decks are often the main vehicle for venture capital and other pitches, but my own idiosyncratic take is that they obscure more than they illuminate. I would much rather see the person try to write out a half-page explanation of the plan, so I can better see if one thought follows from the next, and if one step follows from the next. I learn much better how the person actually thinks. The separate slide-by-slide, horizontal juxtaposition of the slide deck does not (for me) perform that function very well. It can too easily hide structure, or the lack thereof.
So in my view writing is (still) underrated.