"My name is (Jane Doe) and I have opened a new practice in Birmingham, specializing in working with families as they go through the downward spiral of addition."
I'm relatively certain addition makes numbers go up, not down. Jane Doe is not qualified to help families with their math-related issues.
Take writers of books, for example: authors with spelling difficulties are not news. The content is paramount, and spelling is a peripheral detail. That's what editors are for.
I'm not sure which authors you're talking about. From what I know, if you send an editor a story filled with spelling mistakes, the editor's going to toss it in the nearest wastebasket. If he's really nice, he'll send you a letter telling you to learn to use a damn spell checker. Editors don't have time to slog through everything they're sent doing work the writer should have done in the first place.
This is an example of why spelling software on computers won't always be of much help.
They are TONS of help. Your example is just deliberately designed TO pass a spell checker. Sure, there are words they won't catch because they look like another word (although a grammar checker can sometimes catch it), but most misspellings don't look like other words.
We need standard spelling, because we need to be able to understand each other. Personally, I don't want to have to waste brain power trying to muddle through somebody's writing that's written with their own individual spelling because they don't want to learn the same English language the rest of us learned.
Should language evolve? The English language, with all its chaos and difficulty, evolved, and look how fun it is to learn. Do we really want it to go evolving more and getting worse? Personally, I shudder every time I get a text message that reads "hi how r u im god i hope u r 2".