In my language omitting diacritics can change the meaning a lot. "Ji ilgėjosi savo sūnų" vs. "Ji ilgėjosi savo šunų". Many lazy compatriots of mine would write "Ji ilgėjosi savo sunu“. It may be obvious from the contexts, but without it you could interpret it either as the first one ("She was missing her sons") or as the other one ("She was missing her dogs").

This lazy way of writing had some valid technical reasons in the past (like phones not supporting diacritics), but these have long been solved.

P.S: if you think gendered nouns are hard, try language where almost everything is gendered: nouns, verbs, adjectives. In English: "I saw a nice boy walking"/"I saw a nice girl walking". In Lithuanian: "Mačiau gražų vaikiną einantį"/"Mačiau gražią merginą einančią".

And then there is this: https://s-media-cache-ak0.pinimg.com/originals/51/91/e2/5191...