launches are great for building a brand ("oh, this company is shipping") - but they rarely move the needle
yes, you'll get a spike the week of the launch, but it's far more valueble to see the spike go down to levels higher than it was before you launched
Everyone overthinks marketing.
For every product launch we did at X, I wrote the announcement 20min before clicking post.
Better to be launching something every week instead of focusing on how to make a single-day traffic spike slightly larger.