I guess super-colourful text modes were not a priority. The standard Workbench screen was a 2-plane affair and I never noticed any scroll artifacts (on the original A1000).
Also perhaps not all the tricks from the video game world were applied here, e.g. "racing the beam" to update all 4-5 bitplanes in an interleaved fashion at times when they weren't being displayed. Also, didn't the Amiga have hardware scrolling, i.e. you can define a taller display than fits on the screen, and scroll through it by relocating the base address of the bitplanes, and update the off-screen part?
It did have hardware scrolling, but there was no wraparound, so a bit inconvenient for an infinite scrolling-type text display. You'd have had to write a copper program to switch the start address at the wrap point.
Also perhaps not all the tricks from the video game world were applied here, e.g. "racing the beam" to update all 4-5 bitplanes in an interleaved fashion at times when they weren't being displayed. Also, didn't the Amiga have hardware scrolling, i.e. you can define a taller display than fits on the screen, and scroll through it by relocating the base address of the bitplanes, and update the off-screen part?