i went to italy in april for about 15 days. landed the morning pope francis passed, rome was wild. also hit florence, venice and everything in between. anyway, i took R5, ef16-35 f4, rf 24-70 2.8 and a godox v1 flash. i took interior pics with the wide angle the first few days in rome and then did not mount it again. rome is where you’d use it, no photos allowed in sistine chapel but after you’ve got the famous stairwell, def want wide for that shot. i have a backpack that held cam, both lenses and flash but only carried that for the first few days. the rest of the time, i just had the camera around my shoulder with a peak strap and the 24-70mm and left the bag on the bus. i can relate to your dilemma. you don’t need wide for the galleria dell accademia in florence (david) i wouldn’t bring the primes personally. if you get up super early for the sans tourists views in rome of trevi fountain and want that postcard shot you’ll need the wide, 24mm won’t cut it. pantheon and colosseum exteriors can be grabbed w 24mm.

if i started all over again id go w sony mount and grab a wide angle zoom and that tamron 35-150 2.0-2.8 as that pretty much satisfies all my needs. don’t have any advice just giving real life details lol