That's my point entirely. Why is it not grammatically correct? Semi-colons are essentially a 'super comma', and as far as I am concerned, in British English my example of using them for clarity is accepted as being 'not wrong', so by definition, correct.

Just because we don't LIKE something, doesn't necessarily make it wrong.

Grammarians have argued for centuries over what is 'right' and 'wrong' and I am sure they will continue to do so, willn't they?

When there are arguments of validity on both sides, stating that something is 'wrong', (despite common usage), is as meaningful as saying there is/isn't a god (lower case intentionally used because I am not a 'believer')