Slavic languages are related to other European languages closer than Finnish and Hungarian, also the writing system Cyril introduced was Glagolitic, the reason Cyrillic appeared was because students in Bulgaria didn’t want to use the rather complex glagolitic alphabet for everything and already knew the greek alphabet, so they kind of combined them and created Cyrillic
Also, Cyrillic can represent features like palatalization better than the Latin alphabet does, not saying it’s the best for everything but it does have advantages
Slavic languages are related to other European languages closer than Finnish and Hungarian, also the writing system Cyril introduced was Glagolitic, the reason Cyrillic appeared was because students in Bulgaria didn’t want to use the rather complex glagolitic alphabet for everything and already knew the greek alphabet, so they kind of combined them and created Cyrillic
Also, Cyrillic can represent features like palatalization better than the Latin alphabet does, not saying it’s the best for everything but it does have advantages