most domestic manuals would spec tranny filter/oil change at 60K as routine.
Americans tend to ignore this until there is a problem and the old lube has left varnish and the the seals/orings are dried out and leaks and poor performance results ( "seal savers" are made to soften old seals...which will seal better- but is a stop gap.)
the "problem" is that most vehicles do not have a drain in the pan...and require that the tech drop a pan full of fluid which is messy...( aftermarket pans with a drain, cooling fins and fluid extra capacity are available at speed shops- about $100
this is maybe the ONLY time in which suctioning out the fluid through the dipstick tube is allowable*- to drain most of the fluid before the pan is dropped and the filter changed
*chain lube shops sometimes will do this as a cost and time saver- they are also likely to leave the old filter in place...and maybe use substandard fluids.
all those discount coupons are for conventional oils, most cars require a synthetic- which costs more, but works better and lasts longer