Isn't OK, thanks a comma splice? What is the reason for this being the typical form?
OK, thanks is a comma splice and is the typical form. I would say that the reason it is used over OK; thanks is simply convention. Semicolons are rarely seen in English writing, news articles or conversational writing such as emails. I only ever really use semicolons to separate email addresses.
However, (comma :) having said that, I've noticed a few recent blog posts on the use of semicolons which lead me to believe that semicolons should be used more frequently. The best summary is here:
- THEY FORM CONNECTIONS BETWEEN SEPARATE SENTENCES.
- THEY CAN REPLACE COORDINATING CONJUNCTIONS.
- SEMICOLONS CAN BE USED AS SUPER COMMAS.
So in the cited example and using the "rules", then "OK, thanks" is (perhaps :) the correct usage here because the full sentence is "I agree on your point and thank you for it".