Strome actually has more PP points on the season than Eberle, so I'm not sure where you're getting the "no PP playing time" thing from. Difference in ATOI (Eberle = 16:03, Strome = 14:38) doesn't really help your argument either. The difference in ice time between a 2nd liner and 3rd liner isn't exactly a canyon.
Strome is an extremely streaky player, I notice he's put up 5 points in the past 6 games. He'll also have stretches where he scores 1-2 points over a period of 9-10 games and feel invisible. But yes, he'll absolutely go on hot streaks from time to time, so you can make threads about how it's "laughable" to say the Oilers lost the trade.
Eberle's true value to the Islanders right now isn't in the amount of points he's putting up, it's helping mold Barzal into a legit NHL superstar with the chemistry these two have developed. If Weight wanted to force Eberle into playing on the Lee-Tavares line, he'd probably be a lot closer to Bailey's 26 points than 14, but it's more important to finally have two legit scoring lines. We're now fourth in the NHL in goals scored, and capable of putting up 5 goals against any team on any night.