I don't think you are necessarily in the minority. It does seem to be an issue shared by many. And I have personally received many e-mails and requests on that point.
However what makes the matter more confusing is of course that I don't think there is a standard card size in the sense you suggest. I know there is in the standard playing card i.e. poker/casinos etc, but in the case of Tarot there have been numerous variations over the years.
Many decks do have a similar size, especially when they come from the same publishers, but that isn't because they (the publishers) attempt to cater to the smaller hands and convenience of shuffling of their customers, its because the size of their cards is the most economic way to produce them, namely they can print them all on the one sheet.
When I or anyone else self publishes, then I can choose to override those economics for other criteria. That will inevitably cost me some customers who simply will reject them based on their size,(or the higher costs) but that is'nt wrong of them either, its just another example of the diversity and impossibility of getting it right for everyone.