Customer would like to use GTM to collect web data.
How it would affect functionalities of AEP comparing to Adobe Tags?
Customer would not be able to create Edge Audiences and data from GTM would need to be send to AEP in a streaming way?
Well, it's of course possible to implement the WebSDK through GTM, but you will likely have to create the whole configuration as well as sending the events to the Platform through custom code. Don't forget that you will also lose the XDM schema visualization in the UI Launch comes with. Meaning, chances to integrate flaws during the implementation are higher as well.
Bottom line: yes, it's possible, but surely not recommended if it can be avoided.
Of course, GTM is much better at integrating Google products, and if the client does not want to use parallel Tag managers e.g., for performance reasons, he might try to avoid a full migration away from GTM.
But yeah, if possible, I would push for Launch over GTM
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