Of course my theory is only speculation, but it's speculation based on long experience of real life, particularly that part of real life.
As for people who'd rather lead a life of the mind than open up sexually, there are a hell of a lot of reasons that people do that. Some aren't neurotypical, some are just so into their faith or the field of interest, some are psychological hot messes, some are aware that their sexual needs aren't socially acceptable or legal, etc. Frankly, Holmes could be any or all of the above to a sophisticated adult modern reader, but Poirot...
Poirot really does read as a fussy old queen, with his twinkling shoes, girly drinks, and dyed hair! I have no idea what Christie's intent there was, she never really delved into Poirot's head, in most of the books she was described from the POV of other characters or the narrator, she based him on a "funny little man" she only glimpsed once, and his thoughts and feelings were always a mystery. And Christie was gay-friendly for her times, several of the books contain obviously gay characters, who are presented as being no worse than anyone else, she writes about them with acceptance rather than censure, so IMHO there's actually a possibility that she thought of him as gay, and was too discreet to say so.
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