Incompatible with WebProfiler

It might not be possible to get around this conflict without core changes that allow everyone to decorate instead of replace the service
#3096061: [upstream] html_response.attachments_processor service must be replaced instead of decorated →

agreed

Looks like Webprofiler has a decoration solution now:
https://git.drupalcode.org/project/webprofiler/-/commit/43e8aba836c7a696...

(though this: $this->dataCollector->setPlaceholders($attachments['big_pipe_placeholders'] ?? []); looks like it might not handle core's placeholders when bigpipe is disabled - $attached['html_response_attachment_placeholders'])

oh that looks promising. That does look a bit off but it's just their collection so shouldn't be a big deal.

Still agreed core needs a better setup in core but this should solve the immediate issue once its released.

With webprofiler's change I think this is no longer a problem. The older issue has details on changes needed in core to prevent future conflicts if another module needs to replace the same service.