My FS was saying that slow and steady like a plane taking off is much better than a rapid rise like a rocket taking off. Gives better egg quality, he says.
BW I'd heard this too so was a bit concerned when they doubled my dose straight away - I can only assume my levels were still pretty much baseline before the increase. I also had elevated FSH levels a few months prior to our stim cycle (most likely due to my damaged ovary and surgeries etc) which can prevent a response to the FSH stimulation.

Thankfully it didn't affect egg quality in our case! Stimming over an extended period can also affect egg quality so it's like being stuck between a rock and a hard place sometimes I guess.