I'm surprised there are such divided opinions on Landeskog going on an LTIR conditioning stint with the Eagles.
To me, it's a no-brainer... yes, he should.
He hasn't played a second of hockey in over 1,000 days. Stepping into the intensity of the NHL playoffs after such a long layoff is a bad idea. Sure, the level of talent in the AHL is vastly different, but it's hockey. Getting shifts under him, evaluating how the knee feels after the game(s), all that stuff; it's important.
For those concerned he can't take a hit or some contact at the AHL level, I'm not sure what you're expecting if he just jumped in cold for NHL playoff hockey. Are guys like Benn and Marchment going to take it easy on him? I'd rather he has absorbed some contact before that and is able to withstand it. If you're thinking he's going to get hurt in the AHL or that he realizes he isn't ready after a game or three there, that was likely to happen at the NHL level as well. Imagine how demoralizing it would be for his teammates to watch him get re-injured, live, in his first game back on the ice with them. Crushing.
There's absolutely nothing wrong with him playing the remaining 3 games of the Eagles regular season schedule and then getting to rest for a week before the NHL playoffs start. In fact, that's ideal. It gives everybody some certainty; Landeskog, the coaching staff, everybody involved.