Apart from my Werramatic, which has a 100,50 and 35mm lens, if you can find them,(i am lucky in that I have them all) every other camera I use, 35mm or 120, has fixed lenses, either 50mm for 35mm or 75 for 120, and I can't say it has ever been a problem, They are all getting on in years but deliver the goods, and you always have your feet if yo need a zoom.
Richard