I have the same feeling ... however these clients have bought into the Power Apps Dataverse scenerio !!
I love PowerApps and consider them to be a useful extension of tools for Access developers who need to support a remote, or off-premises and disconnected data input scenario. I get that Dataverse is Microsoft's preferred data source for that approach, but if I had my druthers, it would be hosted SQL Server, or SQL Azure, not Dataverse.
I see this an an opportunity to leverage the existing power of Access/VBA/SQL Server via a hybrid interface. In other words, if your Access/SQL Server application needs data input from a disconnected location, PowerApps fits nicely, running on a smart phone or tablet.
License costs are the big challenge. Both are "Premium" services which add $20/month per user to the cost of simply using PowerApps. The licensing cost is greater than say, a SharePoint list backend. So the choice, in my mind comes down to more than what works best; it has to include the ROI on the tool.