Are optics that are fixed at high zoom historical or just for balance reasons? For example, the french MBT’s: 10x fixed zoom both gunner and commander optics from 8.3 to 10.0. but not the amx-30 '72 and amx-30 super (??)
other victims of fixed optics: Russia (t-72 9.3-10.3) and Japan (type 74 8.3-9.3 and type 90 11.3)