Its not about being smart, its about not being stupid. People should be saving where they can, contributing to pensions and living within their means. Its not like we have been predicting the future, we just didn't fancy the risk of living at the edge of our means and a large even causing us massive issues. A large event could be one of us not working for 6 months etc. My partner has just gone off on maternity for a year which we can afford because we didn't take out the max mortgage we could have.
None of this is smug "told you so". We are about to have to remortgage at the end of the year and will probably be looking at a 5.5% rate. We will be fine but I'm damn happy that we don't have a £400k mortgage instead of a £200k one.
A bank stress test is basically saying "can you pay for this" and the customer saying "course I can". Its not like they run a fine tooth comb through your finances and watch you like a hawk and send you messages at night saying "noticed you just got a new lease car, you still good for that mortgage money".
People have had it so good for so long that they did live at the edge of their means because they felt there was little risk to it. As long as the status quo didn't change they would be OK. Well its changed. Most will be OK, plenty won't and some of those people will have been spending like it was going out of fashion for years with no thought of having a rainy day fund or any sort of plan for when things aren't so good. Those people get no sympathy from me.