[jerrre]

A lot can be done post-processing the impulse response (volume envelopes, timestretching, combining with other parts, etc)

As for the efficiency: a modern laptop can easily run ~100 channels of multi-second convolution reverb in realtime on 44.1/48kHz sample rate and <10ms latency in real-time on 1 core.

[acjohnson55]

Yeah, but if you post-process the impulse response, it's difficult to end up with something else that "looks" as much like a real impulse response. If that's important to you.

Don't get me wrong, I'm not trying to argue against using convolutional reverb. I was just throwing out a couple reasons why people still use other approaches.