I think you're tilting against something nobody has said. Namely, no one has said to trade Dach for anyone. Also it isn't a trade for the sake of making a trade -- far from it. It is to leverage a position of strength (LD) to acquire help in a position of weakness (F). You can disagree about the relative values and worthiness of certain players, that's fair enough.
I don't think keeping a top6 spot open for Joshua Roy (9pts in 23gp in the NHL, below PPG in the AHL) is how a reasonable NHL team would approach a season they don't plan to squander.
I wasn't saying you or anyone was suggesting that we trade Dach. Was just a response to your opinion that Necas and Zegras are both better than Dach, which I disagree with.
Agreed we should be trading from a position of strength, but for me - Necas/Zegras is making trades just to make trades. Neither of them are worth both the cost to acquire, and also the cost against the cap when they get their new deals. Just a matter of preference.
Any reasonable NHL team who has been living in the basement over the past 3 years would be smart to evaluate what they currently have before making big moves. We still have a bunch of deadweight with a lot of kids on the way - there are only so many openings. As for Roy, it was his first 23 games last year. So far he looked good, and I'd like to see what more he can do as he continues to develop over trading for necas/zegras. Top 6/9 minutes will help with that, just like it did with Slaf.