The Cleveland Browns and the Pittsburgh Steelers have something in common: both are missing logo designs on parts of their helmets. The Steelers do, however, sport a decal on the rightside of their helmets whereas the Browns adorn absolutely nothing on either side of their hats.
The history of the Browns helmet designs are depicted here in an early 2019 article:
https://www.dawgsbynature.com/2019/1/17/18186569/cleveland-browns-helmet-history
The absence of any adornment of the solid-sided helmet is traditional with Cleveland fans. Most fans not only like this aspect, but love and expect nothing to change.
The biggest change in the last 20 years was going from a white facemask to gray to brown.