Template not found when not using the at sign "@namespace"

[marcusgaius]

Is it possible to make the namespace not require the at sign @ when templates are referenced in code?
I am getting this situation (Twig 3.12 in CraftCMS 4.12):

I understand it's not necessarily the concern of Symfony specific extension how other frameworks deal with their features, but it seems like this is such a small step to achieve it. If I were to modify the module handle to @shop as I did for this example, it can work fine, but I don't understand why can't it be just omitted.