[calabin]

SEC EDGAR is terrible for a variety of reasons. It breaks, few things are truly standardized/normalized, etc. If you have the time and an invested interest there's no reason not to.

Filings are subject to change but they are restated, not modified in place. That said, anything goes on the site.

The only real reason not to scrape everything on a continuous loop is that there is a rate limiter in place, so you may end up impeding your intake of new data by loading yourself down with old jobs to handle.