Get really good prospects you say. Starting with 2017, they drafted:
Vilardi, Anderson-Dolan, Mikey Anderson, Kupari, Turcotte, Bjornfot, Kaliyev, Fagemo, Spence, Byfield, Faber and Clarke who have all appeared in NHL games. Three out of that group of 12 have been dealt in deals to acquire Pierre-Luc Dubois, who is only one year older than Vilardi, and Kevin Fiala. Both of those acquired players were also highly ranked first rounders in 2016 and 2014 respectively.
You incessantly cry about Byfield and his production, and guess what, they're putting him in a role where he's going to have to produce. If he doesn't, they're f***ed, and that's on this team's management, development system, and coaching if he fails. But they've done as you suggested, and they're supplementing younger players like Byfield with talent he can play with, and yet you still whine about it, like you whine about Byfield. The Senators also shifted Stutzle from wing to center, so I guess since he's no longer player the position he was originally drafted at, he's considered a failure as well, despite the fact he's playing better at that position.
Remember when Kempe was used as a center, and how many of you wanted him gone because he wasn't producing? I guess we should listen to these level headed types who are ready to throw Byfield under the bus, because you're always right, and rebuilding will always result in guaranteed success. Just look at the Coyotes and Ducks and Sharks and Senators and Sabres and Canadiens and Red Wings and Flyers and Blue Jackets and Canucks as models of success with their high draft picks and successes. They're all eventual Stanley Cup dynasties.