It is survivorship bias. Because the companies get to a point where unimportant things are important and you spend years in that second phase, the learnings are upside down. „If only we would have solved technical problem X from day 1 we would have so much less hassle in the years to come.“ Except that solving problem X on day 1 instead of shipping what the company did might have killed the company. I see this in a lot of second time founders, where startup 1 was successful - „this time I‘ll really avoid my mistake X.“