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That's essentially my approach to my OGAM warbands. Gods are usually 40mm+, Heroes/Legends 32mm and Mortals in 28mm. This is also helped with different sized bases. I think it looks good and you can tell at a glance who is the big cheese and who is a lowly pleb. My six-year-old has the same idea when he is playing sojers, the biggest one is obviously the king...
For an RPG, I think it would be a useful storytelling shorthand - I guess it depends on how much you want to represent on the tabletop for what I would normally assume is a pen, paper and imagination exercise...
An interesting idea. I'm not sure what I think of it, my instinct is no that wouldn't work. But I have been quite happy using 6mm terrain wth 10mm figures for mass battles.
The only place I have seen this is in some battle reports, I think for the Art de la Guerre (ADLG, perhaps spelled slightly differently..) where the generals are often represented by 28mm figures while the rest of the troops are 15mm. And the reason for this is exactly what you are proposing, that the generals are important so should be bigger.
As for crowd scenes in RPGs - I suppose the question is, is it worth the effort? Its a long time since I played RPGs, but when we did we only used the figures when we got to a tactical combat phase, the rest of the time it was just in our heads. I guess it comes down to how much physical world building do you want to do, to tell the story, rather than needing the figures on the table to make combat precise? It would certainly be cool to have all encounters (combat or otherwise) represented in miniature, but it sounds a huge amount of work.
It me that I could use some 15mm troops as OGAM mortals; I even have appropriately ranked sabot bases for both the close-order and loose-order troops. Hmm ... I might give that a shot over the weekend.
I could see my home-made purple worm making an appearance as Crom Cruach or something.
And the award for most disturbing quote of the day goes to...