well... everyone is different.
And the teams probably do different work, and are in Workfront for different reasons.
Since you're new to the company, there is some value in doing some job shadowing with these different teams -- just follow them around, ask them to teach you how they use the system, why they use it that way (what is the value) and why they wouldn't want to use it any of the other two ways.
Ultimately my feeling is that as long as everyone on the team agrees to use it the same way, and the work over the whole company can be somewhat reported on in a similar manner (i.e. your reporting has somewhat of a theme even with disparate workflows), you probably don't have to force everyone into one mold. I think the right way is to try and foster user adoption and satisfaction, with a bigger picture of data quality behind it.
From a longer term, roadmap perspective, you might also benefit from watching this recent video on establishing a Center of Excellence. https://experienceleaguecommunities.adobe.com/t5/workfront-discussions/system-admin-essentials-estab...
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