Why we can't use long text area for custom field in Salesforce activity

I'm creating an item in Salesforce's "Activities", but why isn't there a "Long Text Area" in the data type options?

Salesforce is a CRM (customer management system) and a web service used all over the world.

Although it is a web service, it has a certain degree of customizability, and many companies use it for purposes other than sales.

Salesforce has "Activity record" to record what kind of activities were done for leads and opportunities.

It is a convenient function that allows you to record what kind of meetings and contacts you have with customers like a history.

And an activity can have multiple custom fields to fill out.

It's convenient to separate the contents to be filled in for each category, but the item has a character limit of 255 characters, cannot use long text area.

It does not appear as an option to select the data type of the item.

Why doesn't the long text area appear?

So this time, I will introduce about "why we can't use long text area for custom field in Salesforce activity".