So my suggestion would be - show, don't tell.
I don't know if you are going to credit me, be offended, blame me or hate me for saying this, but
just for love of the truth, I think that
my game, played on Emperor level in the "[BTS] Nobles' Club LXXII: Ragnar of the Vikings" proves that up to Emperor Level the strategy is "viable".
Being the first game ever I played on this forum, I had not experience on selecting the Screen Shots to take, and I ended up publishing more than 100 Screen Shots of that game, one of them (from the file ragnar.zip relative to the first session on that thread) is attached also here.
Sure, it is just an easy (and probably lucky) Cultural Victory, on an Archipelago Map where for AIs it is harder to attack, but no matter was a game overall bad played with a lot of arrogance from my side, I defeated the AIs and I also got first to Liberalism.
I can assure you I have played better and more rational games than this one (where I made many errors, starting from mathematical one counting

points), and well, from my modest experience (I'm not a good player, but I think I'm decent and I play since when the vanilla version was published) I never felt getting Alphabet early being a strongly bad strategy.
That said, I cite myself from the above post:
Probably this doesn't make it as remunerative as other strategies, neither a good strategy to adopt for the majority of the players, and likely teaching the game it might not be the best approach so not worth be included in a basic guideline. But, academically talking, it is far from being completely illogical IMO.
That said, maximum respect for who spends his time writing tutorials to explain the game to others, in the most possible generic and theorically correct way: just my two cents on the subject, I don't mean to teach anything to anybody.
and, by the way, after seeing on this forum a couple of games on Immortal played by better players than I am, I am perfectly aware that the way I play it is far from being the most remunerative and not the most correct way the game should be teach to newcomers. It's a long while I have an account here, and I've been reading with interest many reference guides on "game mechanics" (example: combat system) in the past years, but never spent too much time on strategy guides or articles. So I interpreted the game mechanics differently: I thought in SP, facing AIs, the important was be the best "somewhere" (example: military, science, culture, ...), now I learn that some other better players think the most rational way to play is to grow harmonically "everywhere".
So, I'm reading what you write with interest.
Hope this post won't be interpreted as trolling. It is really not my intention.

You invited someone else to show something, I did address you to a modest example.
Greeting.
yatta.