If you are in the accumulation phase a recession is not a necessarily bad thing. I've actually been hoping one would hit before I FIRE, so I would have time to buy low and recover reducing my risk. Now I'm getting much closer and the thought of a recession sounds scary. I'm prepared though, I've made it through the rest of them and didn't change my asset allocation and will continue the journey/stay the course.
The problem is you need to be really cashed up to take advantage of it. And you need to hang onto your job.
Example. Your stash is $500,000. You are currently adding $3000 per month to it.
Market falls 50% and takes 3 years to recover. You're adding $3000 a month to a $250k stash now, only if you still have a job.... it's not like you are really winning here. When the market recovers, you might have made say an extra $50k on the $108,000 you've invested over those 3 years, but that + the recovery on the stash still results in less than what you'd make if the market kept ticking along at 7% on your (now gone) $500k balance.
The only way to win is if you had $250k sitting on the sidelines waiting for this crash, in which case we'd call you out for trying to time the market and not being invested now, because you can't predict when the crash will occur, and as we've seen the market keeps moving up in the meantime (see "top in in" thread).
Be careful what you wish for.