I'm not sure what you refer to exactly, but none of the tech presented as solutions in the article really lock you into their model when things "evolve beyond".

I'm not sure what you refer to exactly, but none of the tech presented as solutions in the article really lock you into their model when things "evolve beyond". Quite the contrary, actually. Migrating from, let's say, Django, to something else requires you to basically rewrite your app from scratch. Migrating from SQLPage to Django requires you to run the standard django `python manage.py inspectdb`, then copy-paste your existing database queries, and your are ready to go.