Saying what you think is always important. Also important is a having a lag between thinking something and then saying it. Being able to back up your arguments with data/facts is important but you need to be mindful that being able to do this won’t necessarily win you the argument. Understanding the context of any discussion and the motivation of the various individuals involved in the discussion is also key. You need to give people the opportunity to change their minds and this is partly achieved by allowing people to retreat from an entrenched position gracefully.
It goes without saying that all of the above is far simple as a desk top process that it is when attempting to achieve this in the real world!
On a totally separate note I came across this photo of Brushfield street taken in the 1970’s looking east towards Spital Fields. For anyone familiar with this area they will know that it looks very different now!