Currently acquia_cli requires "consolidation/robo": "^2" which works fine with Drush 10 which had a requirement of "consolidation/robo": "^1.4.11 || ^2 || ^3". Since Drush 11 though the requirement is now "consolidation/robo": "^3". This means it is no longer possible to have the latest versions of both acquia_cli and drush in the same project.
Currently acquia_cli requires
"consolidation/robo": "^2"which works fine with Drush 10 which had a requirement of"consolidation/robo": "^1.4.11 || ^2 || ^3". Since Drush 11 though the requirement is now"consolidation/robo": "^3". This means it is no longer possible to have the latest versions of both acquia_cli and drush in the same project.