One of the reasons why legacy apps continue to live on (despite outliving their usefulness ) is third party tie-ins.
The reason most companies are reluctant to switch from slack is because they have external third parties i.e. their partners connected with external channels within slack. Changing their internal DM/IM system will remove their ability to communicate with their partners in the same system.
Perhaps a plugin where slack messages can be forwarded to Chatto and eventually bi-directional i.e. Chatto messages can be forwarded to Slack.
The reason most companies are reluctant to switch from slack is because they have external third parties i.e. their partners connected with external channels within slack. Changing their internal DM/IM system will remove their ability to communicate with their partners in the same system.
Perhaps a plugin where slack messages can be forwarded to Chatto and eventually bi-directional i.e. Chatto messages can be forwarded to Slack.