If the SERP is dominated by huge brands and AI Overview cannibalizes most clicks, do not invest. If the SERP is mediocre and intent is commercial, invest. If the SERP is missing a clear best answer, invest hardest.
10-20 minutes for a thorough one. Worth the time before committing to a content investment.
For every cornerstone page, yes. For long-tail spokes, a quick check is enough.
Manual incognito + a SERP scraping tool (Ahrefs, Semrush, or a free Chrome extension) for archival.
Yes — add a step to check what gets cited in ChatGPT and Perplexity for the same query.