In this world of many choices, some times some choices are slightly better than others. Needless to say releases continue to be released.
Take for instance the difference between an Excel Workbook and a Power App.
More than likely Excel will meet some of the needs. There have certainly been many companies that have used Excel to solve many problems, because it was the tool available. The same applies to cutting down a tree. You can cut down a tree with an Axe or a Saw, but if you have to cut trees every day then you might want a chainsaw.
Learning to use that chainsaw might be harder than learning to use a saw, but it is worth it.
Power Apps give more and there are different levels of learning and different levels of delivery.
A "Canvas" Power App, potentially a lower learning curve, but a great fit for the person who might just use Excel to solve a problem. A Canvas App can even be an App using data in Excel.
A "Model" Power App, higher learning curve, but meets the needs that can take months and months of green field development. What custom developer wants to build Role Based Entitlement and Complex security?
A "Portal" Power App, a model app PLUS portal offering both the complexity meeting needs that model delivers and the SEXY user interface that users crave.
The key in the world of the Power Platform and the key to any technology is to understand what comes with the offering and what it was designed for and where the gaps are that the developers continue to refine.
The Power Platform might be new to you, but it is not new. The offering includes a variety of maturity layers and is no longer just a sparkle. It is the new agile, it is the platform to deliver empowerment and solutions at the speed that is needed for today.