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lang-tex
\mathbinbetter captures the intent of what you are doing.&\phanom{=}H...on one line of an align environment and then&=H...on the next, they are misaligned, and using (either of) your trick(s) works. According to your (and Stefan's) explanation, this is because the first=one is not a binary operator whereas the second=is. Am I correct in deducing that the reason the second=is considered a binary operator is because TeX considers the text at the end of the previous line to be to the left of=?F&\phantom{{}={}}Hshould produce the proper spacing.