Plans are useless, but planning is essential. IIRC Nintendo had been operating for decades before they shifted to videogames. And Glitch (the MMO that gave birth to Slack) was also very much a product with a plan. Plan failed, or execution failed, or the industry shifted, or something else, or all or the above. But for sure it was not just "a bunch of talented people."
Nintendo was founded in 1889 and basically predates electricity in the home. I think they did a very successful job pivoting to new forms of entertainment as they arose over the years. Not a planning failure in any sense.