Thank you for your comment and your question!
The situation you asked about cannot be considered as the confrontation of the method to the need of a software architect. I'd say, that it is rather an experience that while using an Agile method you don't use a software architect. These two options are not mutually exclusive. You can read about the agile method in my article dev.to/iriskatastic/top-6-software...
You can use a software architect, but it more depends on a complexity of the project. If there's nothing new to implement and you don't need to solve new problems or face something outstanding to develop - you can avoid asking the help of a software architect. In other words, you need a software architect for high-design choices. If there's nothing difficult or you repeat the project you've done before you can use the waterfall or the agile method with no software architect.
Thank you for the clarification. That helped.
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