Training, integration with proprietary internal systems, sheer momentum in the employee base, justifying or even creating a metric to show cost savings of a mig

Training, integration with proprietary internal systems, sheer momentum in the employee base, justifying or even creating a metric to show cost savings of a migration effort, business processes that rely on a specific feature of existing infrastructure needing to be met, the uncertainty of new vs the certain and known instability of something you have.... If you had a small shop with a dozen tech-savvy people and Slack became a problem which was used exclusively for quick business chats, you could probably push a change to another chat platform the next day. You might struggle when you have thousands of employees, some that needed training to use Slack and still aren't that proficient.