The unions and squares are needed for high oxygen requirement yeast strains, such as those from Yorkshire (WY-1469). Others do fine with open fermentation (WLP 022). There are those that are used in conicals by the brewery (WLP-002/Wyeast 1968). As Mark would say, know the yeast you are using and what makes it perform.
Amen to that. There are times when I want to quit futzing around with a bunch of ale strains and just pick one that's fairly versatile, know how it performs under every condition I brew, and use that information to brew a whole span of ale styles. WLP007 might be that strain if I ever decided to go that route. Quite clean at the lower end and nice English character at higher temps. Relatively easy to work with, too.
And sorry for severely derailing this Brewtan B train.
This forum flourishes on derailments! Seems to be how we learn...
My "Yorkshire circle" idea is tailored to yeast that demand a lot of O
2, yes. Everyone has different aspects of the hobby that keep them going. I've been playing around with this idea for a while, hoping to put it into practice soon. While I don't intend to brew these beers using true low oxygen methods, the brewtan b/low O
2 discussions on here have helped me tweak my ideas some.