Around here soft tacos mean the tortilla is not fried,and can be corn or flour tortillas.Also you can buy the large flour tortillas in grocery stores for burritos.You can use regular size flour tortillas for them as well.The large ones make it easier to pack in the filling and also probably to roll up.
I believe in Sonora Mexico they make the large flour tortillas.While corn tortillas are found throughout Mexico, the flour ones are more popular in northern Mexico.They grow a lot of wheat in these areas.
In the Yucatan and some other places,black beans are preferred I have read over the regular pintos,though they do have various other beans in Mexico.
I've had both the flat tacos(tacos al pastor) and the usual crispy kind at Las Palapas in Live Oak.
Think it just depends on where you go and what region someone is from in Mexico.