Completely and utterly wrong. The design aims of t-grains, Delta etc were to more fully utilise the amount of silver used (i.e. reduce the amount of 'dead' grains - there is no such thing as 'silver rich') and improve sharpness, granularity etc on the understanding the users were better able to correctly set exposure (which turned out to be an overestimation of the baseline technical competence of the segment of the user base with column inches to fill in the media) - and hence get faster, sharper finer grained films for a given amount of silver needed, by enabling all of the silver to be used rather than just some.