I think "what should the Phillies do to win in 2026" is not the same question as "what should the Phillies do to win in 2027 (and 2028-2029). There's a Venn diagram, is all. I think the point of Trout is the Phillies would not have to (and wouldn't) trade any Top 5, or even Top 10 prospects for him. The flaws and the money would make the trade price lower, and possibly make Trout more appealing than a less risky player (or a younger, more expensive FA who still wont be young or without risk).
I don't think "RH platoon OF" is an answer for anything though. We've seen that movie before. If anything you want a bigger RHB OF and you make Garcia your platoon guy, just like Bader, albeit as a CF not a big bat, pushed Nick and Kepler into a platoon.
I don't think the WS window has closed if they can make the playoffs. But the latter is still not certain. Or even likely. Also not really necessary to discuss until July, unless the Angels or another team with an interesting chip start early.
But that doesn't mean we're gonna like the moves going into next off-season either. Trades and free agents, not a rebuild, would be my guess.