Sorry man, but yes lol. Hronek isn't awful. It just seems that way because he's overused, and his defensive faults are obvious. But he also has good attributes to help mitigate them. He has good compete, even if that only takes him so far given his smaller stature. He has a high panic threshold and gets the puck moving out of the zone without it being a hand grenade (an underrated attribute by many fans) like it's been recently for a painfully large number of Detroit "PMDs." He generally shouldn't be used in serious defensive situations, ideally, but I'm positing that on a better team, with a good top-4 and an appropriate partner, Filip Hronek can be just fine as a #4. A very good one even. His defense in that scenario would present as adequate enough. I mean, if you can improve on him, go for it. But the Wings will likely have bigger holes to fill yet.
Since the Wings are not a good team, do not have a true #2 or #3 dman, and there's no one who fits the bill as the kind of partner Hronek needs.... projecting him as a good #4 is hypothetical of course.
P.S. Trading Hronek instead of Leddy so that your team is better defensively is..... a weird proposition lol. Leddy almost could not have been any worse defensively for Detroit this season. As bad as Hronek may have been this season, Leddy was virtually rock bottom.