Current XR research continues to focus largely on controlled laboratory settings, leaving a critical gap between technical capability and real-world robustness. And thus, XR interaction is still rarely examined through the lens of situational impairment. This workshop aims to provide a forum for researchers and practitioners to examine the factors that continue to limit the everyday adoption of MR, to reflect on how existing interaction paradigms degrade outside controlled settings, and to identify methodological approaches that are better suited to ecologically valid evaluation. We expect discussion to focus on issues such as mobility, divided attention, and changing physical surroundings, as well as their implications for usability, accessibility, comfort, and robustness. Through these discussions, the workshop is expected to establish a clearer conceptual framing of real-world constraints in MR and to outline a research agenda for designing systems that can better support ubiquitous everyday use.