I predict that there will be a renaissance of this over gas protocols in the very near future. There will probably be even more fine products created, but, even if there isn t, you can do just fine under most circumstances without the hassle of gas. You just need to know what to use, how to be flexible with the protocol, and stay awake and alert at all times. The only thing I worry about is that there will no longer be clinicians and surgeons in the vet schools who know how to do it themselves. When I was in school, I know they promoted brand names manufactured by companies that gave bribe money to the school.
Gas anesthetics are part of an expensive racket.
My clinic has the latest gas machines and technology and I use all the gasses as well as having utilized nitrous oxide when I performed more orthopedic work. You may be all defensive of gas now. I see newly-minted vets coming under my tutelage frequently and from them you would never guess that they are supposed to be moving rapidly. The steady blanket of gas anesthesia helps create a relaxed, careless mind that easily loses the focus and dawdles. Clipping takes forever, prep forever, pack opening and scrubbing forever and so on.