There's a lot of scary talk about nets of all sorts spreading diseases and both fishery managers and clubs are frightened that someone will introduce a disease through a net that's been used on a diseased fishery elsewhere.
It's poppycock, mostly. The chances of introducing a disease via a net are as likely as finding an alien planet within easy reach of Earth, but best not to go there eh?
A lot of commercials started introducing dips, but the big trouble is, the nets need to be soaked for 30 minutes or more and in FRESH solution. The managers couldn't be bothered to keep replacing the solution and they have no faith in anglers drying their nets, which is the best form of disease prevention. So, the best solution (pardon the pun) is to ban keepnets at least.
From a personal perspective, I no longer use keepnets except when fishing the annual Clattercote match and even then I don't use them, mainly because I catch nothing to put in them. I suppose the only other time I would use them is when I would be fishing for roach and bream etc. on a river. The captured fish have a better chance of survival IMO if all released at the same time rather than being let go one at a time for the waiting pike to feed on.
Otherwise, I don't miss them at all.