Whether your startup starts strong or not, you really need to be prepared for opportunities for interative adjustments. Ignore them at your peril. Or at least your loss.
Of course there's a balance required between adjusting course and staying focused on your strengths, but the number of current major tech players who started out with totally different products/services at their core is astonishing.
No plan survives contact with the enemy. - Field Marshal Helmuth von Moltke
It's got good advice if you are investing serious money or time. OTOH my advice is, if you project is of the throw-it-against-the-wall-and-see-if-it-sticks" variety, you are even better off. If it has a glimmer of hope, iterate. If not, move on. I have done the opposite and it's why I am a thousandaire rather than a millionaire.
Of course there's a balance required between adjusting course and staying focused on your strengths, but the number of current major tech players who started out with totally different products/services at their core is astonishing.