I got back into biking after a 25 year hiatus. I bought a Domane 6 with Di2, but saved my old Fuji Del Rey. I still ride both, and the difference phenomenal......if riding hills. On flats, you won't notice a heavier bike as much, and those silly down tube shifters don't bother me as much.
But the Fuji beats up my 55 yo body a lot more, and lacks the fun factor. Was the extra 4k worth it? Absolutely!!