Did you read my entire reply in post #13? I specifically stated that OEM's prefer the diaphragm style bleeders or electric bleeders for this exact reason.
Since you have high regards for BMW's position, this is their exact statement on their dealer tool page:
View attachment 189009
www.bmwcentersolutions.com
Someone copied and pasted GM's instructions for the C8 Corvette. They have a similar concern about exposing the fluid to outside air; they recommend the diaphragm style (Branick) bleeders:
View attachment 189012
C8 Tech/Performance - C8 brake bleed discussion - Track Prep Guide says to swap in fluid with dry boiling point of 590 or higher for trackdays then back to DOT4 for street. Personally, I will flush the OEM to SRF and do my normal annual heavy bleed. With the brake by wire, the early high level...
www.corvetteforum.com
Point is, OEM's do agree with you about pressure bleeding, but they do not consider your style of pressure bleeder to be acceptable.
Good question. Just posted a new thread about the Speedi-Bleeder - if that one is connected to a portable air tank with nitrofill snake oil, I wonder if that would be a happy medium.
Agreed. And
@edyvw doesn't seem (or want to) understand that.