I do get your point Alexa. & I don't think it's clear cut because nobody actually knows for sure so, in that case, all that can be done is a) take the advice of experts - in this case, forecasting economists and b) gamble on the LEAST risky situation.
That isn't without difficulty in itself. Those economists pretty much unanimously agree that a No Deal will be more damaging than positive for the British economy- but there are Disaster Economists who have a vested interest in engineering this kind of situation. These are in the minority though. When it comes to picking the LEAST risky situation, it's incredibly subjective- you have to weigh up whether the risk of doing nothing is greater than the risk of doing something....and it may come down massively to tolerance levels, which are at the social segment if not individual level.
For example - will all flights and travel suddenly stop if we No Deal? No. Will there be more checks and longer delays - yes, very likely. If you can't afford to take holidays or only do so very rarely, this is going to be of considerably less concern to you than if you travel across countries on a weekly basis for work and have tight deadlines for meetings etc.
If you already don't have a job, or have one that pays poorly and is meaningless to you - or that is highly interchangeable eg working in one cafe vs another, you are less likely to be concerned about widespread redundancy for the medium term whilst the country restructures itself.
If you aren't saddled with a 1k+ mortgage or private school fees, perhaps rising interest rates and the pressure of maintaining these is less of a concern. If you don't have a house to sell or haven't spent 80k on renovation works, the prospect of negative equity as the bottom drops out of the housing market will not terrify you - you're more likely to embrace housing becoming more affordable at last.
And if you struggle to afford food basics each week, you probably couldn't care less if the price of items like chopped tomatoes, olives, yoghurts, tuna etc increases. Or that there is a significantly narrower choice than you've been used to.
Yes, you could absolutely say well "Boo Yah Sucks" to all those who are feeling sorry for themselves to risk these things. We've had it bad for ages, welcome to our world. I've heard this argument a fair few times and I do 100% understand the resentment....what I don't necessarily get is the sentiment to risk and sabotage the lives of not just all the adults who have this but all their kids too, without being CERTAIN that things will improve by doing so. Would you really wish to inflict the same hardship on everyone, for little more than an unknown chance?
And actually, even if that chance were to work- what we're essentially talking about and the sentiment driving it here is some form of Communism. Someone has to lose and someone has to gain because we're not starting with a blank slate. And that's the root of why everyone can't possibly agree or come at the same thing from the same angle, because it depends on what you already have and your tolerance for risk....
Sorry that was long but I think it's really important to understand