FrogReaver
The most respectful and polite poster ever
There are lots of answers to the problem outlined in the lead post.
My guess is that creating a situation where martial characters dominate the arena of combat (with spellcasters being relegated to support or bystanders) and spellcasters solving all (or at least the overwhelming bulk of) other play obstacles (with martial characters being relegated to support or bystanders) is also a non-starter.
Alternatively, you can have obstacle engagement be a dynamic, emergent property of play while simultaneously having strong, coherent archetypes. You can have niches where you don't dominate specific arenas and relegate other "classes" or "playbooks" to mere support or bystander status.
Which is a non-starter because the fiction we are modeling has spells that occur on demand...