It is possible to to reveal the impacts of asymmetric routing through other tools, for instance ThousandEyes can do this by performing a time synchronized bidirectional trace (among other things it can do that MTR cannot). This can be very valuable.
That said, in practice for the majority of end users, they will not be directly impacted by asymmetric routing, if only because so many services are now cloud-based and the major cloud devices are direct peered with all of the major ISPs at regional meeting points in most countries. As an example, on my connection in Denver on Comcast, going to most applications in AWS will enter the AWS network /in Denver/ and without traversing any transit provider, meaning effectively my traffic never goes across "the Internet", it goes from Comcast (my provider) directly to AWS (the provider for the application).
While it's always good to be mindful of the complexities of real-world routing, for the vast majority of common use cases now, entry-points to the target application are so widely distributed that the most impactful routing is inside the private network of the cloud provider, not across the larger Internet.
Disclaimer: Opinions are my own.
