*feels a familiar pull*
Scarred Lands magic isn't low magic per-se. It is, however, a tad more than "magic trains" and "ancient magical empires." since neither of those exist currently.
It is currently a low magic item count in terms of being a buyers/seller's market for the most part. (Some like Hollowfaust can offer stuff). There's no mega Wal-mart outlet stores in most rural to semi-urban areas. There are, however, large to huge caches from the Divine War/Titanswar that are probably still hidden somewhere.
The core classes exist, with sorcerers and druids being kind of the "outcasts" of society. Wizardry is still not a wholly honorable profession, but it's more accepted by some than sorcery.
Ritual magic tends to take the place for when spellcasters run low on magic or need a power boost but only in very critical situation. Same is true for True Rituals, powerful spells that I feel can often exceed the Epic spells of Epic Player's Handbook.
The only reason it's considered "low magic" is not everyone is 100% spellcasters except for clerics and the more than occasional paladin/rangers. It's more about the rangers adding to the survival of others, (especially against their favored foes), the clerics offering solace and protection by serving the Gods of the Scarred Lands. Plus the paladins too but usually for only Corean, Madriel or Hedrada.
It's not FR where everyone and their mother can wield spells, or have spell-like powers (except for maybe a small handful of Titanspawn), dragons on Ghelspad tend to be much scarcer. It's not Eberron either, where the average spellcaster serves for a political country or even for a goal. The Scarred Lands magic is focused more on perserving, helping and causing thriving civilizations to thrive more. Plus the usual fighting as well.
That's what Scarred Lands magic is about.
See
this thread for further insights into the Scarred Lands.