Angular was a reasonable choice - it's well suited to "enterprise" web applications as it has standard ways of doing things the Angular way in contrast to React which has 3 - 5 options for different things. Certainly back when it was chosen, there's no issue in this choice.
Mulesoft, personally hate it - but it's definitely an option if you're trying to abstract out a whole bunch of legacy systems into clean APIs. Personally, I'd probably create some lightweight integration components in custom code (whatever language you like) deployed in containers on some scalable cloud platform over buying a chunk of enterprise middleware and trying to find the skilled resource to configure it. But, I don't think Mulesoft was a death knell here - merely a bit of a money pit. Same thing for AEM.
Overall, it doesn't look like they were choosing unreasonable tools to do the various things they wanted. e.g. they weren't trying to use Salesforce as a transactional database platform.
You could definitely pick a better stack, largely from open source, and deploy to the hyper-scale cloud provider of your choice - but I don't think the tech stack that's what screwed this project up overall.
Mulesoft, personally hate it - but it's definitely an option if you're trying to abstract out a whole bunch of legacy systems into clean APIs. Personally, I'd probably create some lightweight integration components in custom code (whatever language you like) deployed in containers on some scalable cloud platform over buying a chunk of enterprise middleware and trying to find the skilled resource to configure it. But, I don't think Mulesoft was a death knell here - merely a bit of a money pit. Same thing for AEM.
Overall, it doesn't look like they were choosing unreasonable tools to do the various things they wanted. e.g. they weren't trying to use Salesforce as a transactional database platform.
You could definitely pick a better stack, largely from open source, and deploy to the hyper-scale cloud provider of your choice - but I don't think the tech stack that's what screwed this project up overall.