Is magic still quite rare in your world because it requires a "special power" or is it just a job anyone can learn? Most D&D settings replicates the Dark Ages, with collapsed trade network and wizard in their towers... As soon as universities appears in a world where anyone can learn to cast a spell provided he get enough training, you will see kings pouring money into unis. It's too valuable, before the industrial revolution, to have a cadre of wizard at your service. Add the infrastructure that allowed the IR to take place and you'll have mandatory education instated before it happened in the real-life timeperiod of the IR. And if you have mass-wizard, the setting justs gets very weird.
Even if the prevalence of wizard is low, you'll have infinite energy. Necromancy is baaaad, OK, but nobody would frown at an undead mule powering your wheel. You'll just have more difficulty creating armies of undead beast of burden. Free Energy, no coal needed. Spells that moderately change temperature are especially cheap in 5e (i know the system wasn't mentioned, just using it as a example) because they rarely have a gameplay impact, but the ability to create free energy would change the world.
Even if the prevalence of wizard is low, you'll have infinite energy. Necromancy is baaaad, OK, but nobody would frown at an undead mule powering your wheel. You'll just have more difficulty creating armies of undead beast of burden. Free Energy, no coal needed. Spells that moderately change temperature are especially cheap in 5e (i know the system wasn't mentioned, just using it as a example) because they rarely have a gameplay impact, but the ability to create free energy would change the world.