I would totally agree with this. Oxidation absolutely kills fresh hop aroma.
Closed transfers are really a great way to go if you are not doing this already.
Also one issue that we do not often talk about is the issue with silicone keg lid o-rings. Many customers thing that if a keg is under pressure that the oxygen will not get in but this is completely false. Oxygen can pass through silicone fairly fast and fairly easily and even when the keg is under pressure the process of diffusion still allows oxygen to get into get into the beer. The keg lid o-ring is a large o-ring with lots of cross sectional area and as a result of this the transmission rate is high too.
Also in the past decade we have seen a large movement of customers choosing Silicone as the keg lid o-ring choice because its:
1. Chemical resistant
2. Has very good spring properties and doesn't compress flat like the old nitrile o-rings
3. Is soft and can tolerate poor lid alignment
Despite these great features above the main issue is that silicone has terrible oxygen transmission rate and has orders of magnitude higher oxygen transmission rate than other rubbers.
We have been trying to educate customers on this topic but customers keep purchasing silicone o-rings unfortunately and it's probably our fault for not doing more education on this subject.
The oxygen permeability of silicone is well known and well documented but not spoken about in home brewing for some reason. Similar silicone was put into contact lenses years ago and the high oxygen permeability allowed "extended wear contact lenses" to exist. The high oxygen flow through the silicone material allowed people to wear contact lenses for weeks at a time which previously was not possible.
We did spend a lot of time and money doing a lot of testing on o-rings and rubber compounds and we came up with this o-ring type:
Suitable for any 19L, 9.5L Corny Keg Ball Lock or Pin Lock.
This material has way higher oxygen barrier, it doesn't perish like the old nitrile o-rings, has similar chemical resistance to silicone and is similarly soft. It has ever so slightly worse spring properties but still way better than the older nitrile o-rings. For the sake of $2 I would highly recommend this upgrade.