thirty six years ago I did just what was being discussed here, in a property I lived at,
there was no problems, until just a few years ago, my folks moved into the place when I moved out, and my mother planted some popular trees in the yard, about 15 to 20 foot from the building, now those trees have spread out roots, and apparently sent them under the building, as about once a year one needs to run a "heavy duty drain snake" type machine down the drain to clear it,
the line is belled Cast iron, if it would have been a solid and glued plastic line I do not think there would be an issue,
and the trees could be removed,
another party lives there now,
I really do not under stand the roots 20 foot from edge under the cement slab tho, as I would not think it would be that moist under there to draw the roots, (unless there was damage to the line many many years ago) before the building was built, the building or slab has not moved, there are no cracks in the slab.