pgadmin vs schema migration

Hello everyone,
if I have a live app running off a postgres db (containing data)
and I want to make reasonably simple schema (and possibly data
content) changes, are there any dangers in just using pgadmin (e.g
adding a column) as opposed to using some type of migration software,
e.g. south. I'd keep my models.py up-to-date with any changes I make
to the database (in case of future uses of the app). I haven't seen
anything online warning me not to do it, but the separation worries me
slightly

Thanks

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