To view users or accounts that belong to a segment

It would be great If we have an option to filter out Audience/Accounts by using Segments. Using this feature we can know how many users/Audience will qualify for a particular segment. Instead of applying more filters every time, we can have a segment created and use it. We do have a workaround by using the Email Engagement for preview or using the rules in segments directly as filters. But Having a segment as filter makes things so much easier 

Agree, this would be helpful for me too!  Having the ability to reuse segments throughout PX vs recreating filters over and over would be a huge timesaver and also likely lead to more consistency in reporting and targeting.