We do not yet have access to Earnings Estimates on Seeking Alpha, but are looking into adding them soon. Thanks for the feedback!
Forward PEs are obviously just guesses, and not even attributed.
PEs based on latest actual earnings are facts (at least somewhat factual--there is of course the question of GAAP vs non-GAAP.)
Publishing forward PEs tends to encourage speculation by inexperienced or careless "investors" who may take them as reliable, or even as SA's own investing advice--not something I should think that SA would want to do.
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