> 1. Is specifying -optimte 9 good enough to be the only one left?
>

AFAICT optimize 9 is the default anyways. Currently the values are used the 
following way:

   - 0: automatically used when -draftCompile is used or when configured 
   manually.
   - 1 - 8: maximal amount of optimization passes for the Java AST and the 
   JS AST. If change rate between passes is below 0.01 then optimization will 
   stop.
   - 9: Apply 100 optimization passes and only abort earlier if change rate 
   between passes is 0.

So when you use -optimize 9 there is probably not much left to optimize 
from a GWT compiler point of view ;-)
 

> 2. The reason for the removal states that it never worked with source 
> maps, but source maps are only useful during development, when noone uses 
> optimization?
>

I was a bit surprised too about the removal, but I am pretty sure its not 
just about source map issues. If I remember correctly the compile report 
did not work too when using closure compiler backend. But I never really 
used it so maybe I am wrong. I have never seen reasonable code size 
reduction when trying it on a large GWT app and thus avoided the risk of 
using an unfinished, experimental feature. It simply wasn't worth it for me.

It would have been nice if the closure integration would have understood 
the JS import of 3rd party GWT wrapper libraries as thats still a major 
pain point in GWT. Use a lot of wrapper libraries for GWT and your code 
size will be pretty large, as GWT can not optimize that external JS to only 
what you need. At least you won't have that issue with J2CL + JsInterop 
anymore.

If you want to continue use that closure feature of GWT, just fork GWT and 
revert the change.

-- J.

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