> About 10 years ago this argument ceased to hold much relevance. Or, at least, it did for all IDEs I've investigated. The complexity of editing a sack of code, CPU-wise, hasn't changed all that much, and 10 years has had quite the impact on how cheap 'hardware that can run IDEs without breaking a sweat' has gotten.

I really disagree here. Building C++ software with visual studio takes ages, its auto completion feature breaks VERY OFTEN, and after enabling C++20 for a Qt project, compilation times were 3 times longer.