Laine was primarily a LW before the NHL. Dano was primarily a RW before Chi. Roslovic is a C/RW. Petan is a C/LW. I don't know if he has ever lined up on the RW 5v5.
I don't want to see Roslovic at RW as long as he remains our best bet for a middle 6 C. He is needed much more at C than at RW.
Wingers playing there opposite sides seems to be very much a European thing, for some reason. Ehlers seems to have completed the transition to LW. Laine is well on the way. Dano does not seem to be making the adjustment. If it were up to me I would just put him back at RW.
I think there are good reasons to switch these players to the conventional sides while they are young but if the switch doesn't take there is no need to force it. OTOH if the player adjusts well there is no reason to then switch back unless it is some temporary thing, like an injury fill-in. It is an obvious advantage to have wingers with substantial experience on both sides, particularly if they are near equally good at both.
I like to imagine giving opposing coaches headaches.
2-3 years from now, when Laine is the dominant goal scorer in the league, some coach comes in prepared to shut him down on RW. 2nd period he is lining up at LW.
Coaches have tried to convert Dano to LW in the past without success. I hope in this case PMo is not turning it into a battle of wills. If Dano can't/won't succeed at LW, put him back on the right side. Its not like we don't have room on the right. Dano could thrive at RW on a scoring 3rd line. MLA could be the best 4th line in the NHL. Or if nobody pushes Lowry down then Matthias - Copp - Armia could also be the best 4th line in the league. If Dano can't push Armia down then he is fine at 4RW too. It is just win/win/win.