I agree with you there, but the key is the last part about being understood. In OP’s case they’re insisting on using a formal writing style that makes the average person perceive their message with an unintended tone.

Young people focus on the tone they’re conveying.

Old people focus on following the rules that were beaten into them as children for no reason.

Is your intention to convey a certain tone or win a grammar competition?

YES IM JUST EXPRESSING MYSELF, ITS TOTALLY EVERYONE ELSES FAULT FOR FEELING OFF-PUT BY MY TYPING STYLE. THERE DEFINITELY ARENT SOCIAL NORMS AND CONTRACTS THAT WE ALL FOLLOW TO BE ABLE TO EASILY AND ACCURATELY COMMUNICATE.

They didn’t say do it right, they said do it with propriety, as in making sure to follow the rules for the sake of following the rules.

Because those of who grew up communicating a lot via the written word stopped feeling beholden to type using classic grammar rules like ending every sentence of every communication with a period no matter what.

The entire purpose of language is to express yourself, and people started noticing that their texts sounded friendlier if they sounded less abrupt, so they started typing that way.

You type according to traditional essay writing rules which is how older people learned to write, younger people learned to focus on producing natural sounding language and conversation.