They said they will get rid of this option eventually.
Just because there are changes, doesn’t mean we all should just simply go “oh okay” with them. Noone is really asking for new tonemapper to go away. We are all well aware that others need such a way of handling tonemapper and we respect that.
What we are mostly worried is that, there is simply no way to get the old bloom now. Any game that relies on neon lights are in a hopeless situation, or eventually will when Epic Games removes the old tonemapper completely, making that little command line useless.
And locking your engine is not always the best option. No engine version is bug free. For example 4.14 and 4.15 has child actors having their values reset with literally no reason and extremely random. What if they fix the problem in 4.16? You see, the bugfixes are not coming for every version which isn’t a logical thing to do in the first place.
Also, this is not a simply “oh update your assets to new look” thing. There isn’t really a good way to update to get the old bloom, you can’t even get close it. I don’t mind working for hours to get what I want, me and people like me working years to achieve even a little thing, but this Tonemapper decision came too quick, without asking any opinion of us, the developers in the first place.
TLDR: Noone’s crying about new changes. They are crying for losing the old tonemapper that some need as it will be deleted at some point.