I ask this without having my own opinion on the matter: Won't those debates improve the design of the architecture? It's hard to imagine the time loss of debates being greater than the time loss of a rearchitecture.
Only informing them about this, in some cases, is not enough.
It would really be well if people realized their bias, but they rarely do.
A lot of engineers will say things "We need to use X, because Google, Facebook, etc use X". All the while ignoring the fact that Google and Facebook deal with massive scale, have tremendous resources to bear, and hardly get penalized by their customers when things break. The tech is only one small part of a much larger puzzle.
It's often easier to suppress such debates than engage in them, especially in the early days when you don't have the luxury of time. I'm not saying it's always the right thing to do, but it's often not the wrong thing to do for a team to continue shipping at a regular pace.