Check if the segments have "Share with Exp Cloud" checked. I am not an expert in DOMO so I am not sure if that could be the reason.

You may use in built feature to compare data between date ranges. Right Click on the metric > Select Add Time... and then select a time period. Let mw know if that helps.   

There is a limit of 150 processing rules with 30 conditions in each rule for each report suite. This is standard irrespective of the License type.See How processing rules work (adobe.com).The number of evars/events depend on the license type you have.Adobe Analytics Offering - license, SKU, package ...

We would need to check the Launch property for any issues. Please open a support ticket with Customer Care.

You may use Admin API 1.4. Check the following docs: https://github.com/AdobeDocs/analytics-1.4-apishttps://github.com/AdobeDocs/analytics-1.4-apis/blob/master/docs/admin-api/methods/report_suite/r_SaveEvars.md

Implementation plugins are part of Javascript implementation. For, SDKs, you would need to write your own code. Or, as Andrey said, leverage Visit Number dimension to create segments.

As of now, Workspace does not have the ability to export multi-dimension data in CSV. We may expect this feature in upcoming releases. In the meantime, I will encourage you to use Data Warehouse for multi-dimension exports. 

This is expected when the expiration of tracking code is not set to number of days. That will cause the tracking code to persist in the next visit even if the visitor arrives using a direct channel. If the expiration is set to visit, I will advise reaching out to Customer Care who will help you revi...

Unique visitors are tracked using visitor ID cookies. The values of this cookies are later translated in to post_visid_high and post_visid_low columns in Data Feeds. You may concatenate these two values to identify the hits from a unique visitor.See: Calculate metrics (adobe.com)

I do not have much idea about Pardot Salesforce and if you can insert Javascript to those pages. However, you may insert a hard code tracking pixel which will send data to Adobe Analytics. Check this doc: Implementing with hardcoded image requests (adobe.com)