The idea is to reduce as much pressure as possible to promote ester and phenol production
that is why all the hefe breweries in germany use short, super wide, open fermentation and top crop their yeast as opposed to pulling it from a conical
downside to this is production scale
you can fit twice as many fermenters in a space that are taller as opposed to wider
also, if you aren't really doing beers that are pro-ester production, such as IPA's and pale ales, it doesnt really matter
other thing to worry about with a super tall fermenter is CO2 scrubbing of esters
as the CO2 bubbles up, it brings aromatic compounds with it
the less distance to travel up, the less distance to carry things away with it
that is why all the hefe breweries in germany use short, super wide, open fermentation and top crop their yeast as opposed to pulling it from a conical
downside to this is production scale
you can fit twice as many fermenters in a space that are taller as opposed to wider
also, if you aren't really doing beers that are pro-ester production, such as IPA's and pale ales, it doesnt really matter
other thing to worry about with a super tall fermenter is CO2 scrubbing of esters
as the CO2 bubbles up, it brings aromatic compounds with it
the less distance to travel up, the less distance to carry things away with it