David Widmann

I think nobody likes AxisArrays, including me :smile: Nevertheless we need some concrete motivation and clear advantages for why we should make these breaking changes and why it is good...

Maybe before I reply I should repeat that I'm not against this change (as I said nobody is really happy with `AxisArray`) but that the current discussion is just a...

> Why not just use a NamedTuple holding a separate Array for each variable? Why does the data have to be in one array? It doesn't have to and we...

Yes, I can see that this is annoying if you want to add a single column. `hcat` would be my suggestion as well: ```julia julia> chain = Chains(rand(100, 3, 4),...

One has to make sure that the ranges are equal when calling `hcat`. Otherwise, it is unclear what the range of the output should be. One can reset ranges with...

Should this issue be moved to MCMCChains? There's a more general issue (https://github.com/TuringLang/MCMCChains.jl/issues/253) but IIRC it does not discuss weights for multiple chains explicitly.

Seems something is holding it back.

In #383 we saw that some dependency still holds it back. IIRC eg JuliaFolds (eg BangBang) does not support Compat 4 yet.

Is it better (or worse) if the output format is changed to png?

Ideally we would allow to use matrices/3d arrays (current setup) as well as StructArrays (as discussed in some of the issues or PRs IIRC). Both have their advantages and disadvantages...