Glass is not permeable to gas at all.
On the other hand, HDPE is the most oxygen permeable material that brewers commonly use. PP is similar but less common.
One post in the last 6 months.
Why not?
Maybe, but that's oversimplifying things.
The character of the beer is different when Brett is pitch up front vs. after primary fermentation.
LAB domination before Sacc fermentation also tends to mute ester formation by the Sacc (I can't find where I first read this, but it's been my experience too). Lower Sacc esters potentially lowers the Brett character.
I believe this is the reason why Belgian brewers use hops to prevent Lacto from souring before Sacc completes fermentation.
To be clear, I'm not saying there's a right or wrong way to pitch, just different results.
In an exbeeriment most tasters preferred the Brett pitched after a clean fermentation:
http://brulosophy.com/2018/05/14/mi...-staggered-microbe-pitch-exbeeriment-results/
Myself and others have had successful souring from pitching bateria after or during yeast fermentation.
Transferring to secondary is not necessary, and leaving on the primary cake may increase Brett expression and souring. Again, either way works, just different.
I agree with not using starters on blends, generally speaking.
Some food for thought. Cheers!