My experience was exactly opposite. For my first grow, I let pH range from low 5 to mid 6. All worked well.
For the second grow, my clone source, suggested I keep pH in the low 5 to mid 5 range, as this strain likes that.
Both grows were the same strain. The second grow with lower pH had much stronger stems and branches to support enlarged buds.
So, I might suggest folks check what information they can get about their precise strain and adjust pH accordingly.