The only problem with what you say is if there is any movement in floor, hair line cracks will apear and leak,I agree with what you say about neatness and easier tiling because using this trim can be tricky.
Hairline cracks will appear where? i dont understand where you are coming from.
the correct way to do the job is to true the wall up, then tile, fill bath with water, silicone around the bath, let the silicone cure then remove water from bath, so where will these cracks come from even if there is any floor movement, you really have m,e at a loss here