I recently bought a Trek Domane SLR7 and used Project One to upgrade some bits (mostly because of availability). Ended up with a bike just under 18 lbs and it feels so much lighter than my 2019 SL5. The bike is vastly more expensive but it's also obviously better basically everywhere. It will definitely be my do-it-all bike for (hopefully) many years.
Di2 is great. Being lighter is great. The bigger tire clearance is great. The vastly better wheels is great. The saddle is better (stock P3 Verse Pro vice Arvada Xomp). The storage compartment is great.