Why does Tinker v. Des Moines remain an important precedent-setting case?

Tinker v. Des Moines remains an important precedent setting case as its subject matter, freedom of speech, is relevant to this day, especially in the ever changing political climate

Explanation:

The outcome of Tinker v. Des Moines determined that student's do not lose their first amendment right to free speech on school grounds, and it's unconstitutional to limit a students speech as long as it's not harming anyone.

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.