I get bad sides from deca but mine are all gyno related. My tits hurt but my sex drive is high and my boners are completely normal. Thst being said, this is kinda a impossible to answer question. I do think the risk of getting one of those year long stories is slim to none, that's like a freak occurrence. If you do get ed it's more likely once you correct the imbalance of estrogen and prolactin or whatever is out of whack or remove the deca and it clears, your good, usually.
You can start by taking p5p a few weeks pre cycle and through the cycle and keep estrogen within range. And have caber on hand. That would be the best "play it safe" approach in my opinion. I'm using deca currently and I've tried several times to like it, but my tits hate it