If the Cubs feel these guys are playing at their peak and will regress, I agree on being sellers of those guys.
But I feel Bellinger & Stroman would be solid over the next 4-5 years based on their 2023 play, so try to keep.
It's fools gold to think the Cubs are a deep playoff team in 2024-2026 with Swanson, Horner, Morel and prospects. At some point the Cubs have to stop being sellers and be builders.
At this year's deadline, I would look to move solid players and get solid players or prospects in return. If I was Hoyer, I would try to move guys like: Mancini, Suzuki, Happ, Madrigal, Fulmer, Leiter.