The introduction of Mary Morstan as a capable, secretive former assassin provides a strong female character integrated into the plot via John's romance and her skills aiding the duo, but this feels organic to the modern adaptation's action-oriented style rather than feminist activism or empowerment messaging. Queer subtext between Sherlock and John exists through fan-favorite banter and emotional tension around the wedding, yet it remains incidental subtext without explicit LGBTQ+ representation, identity exploration, or canonical romance—drawing queerbaiting complaints from fans wanting more overt content, not accusations of preachiness.

Casting adheres closely to source material with white British leads fitting the London setting, lacking forced diversity, race/gender-swaps of established characters, or DEI critiques; in fact, some note the show's relative lack of diversity compared to contemporaries. No creator statements emphasize social justice intent, no dialogue lectures on systemic issues, and reception backlash centers on perceived drop in case quality and filler episodes rather than ideological intrusions. Overall, the season prioritizes entertainment, character arcs, and Holmes-Watson bond in a neutral, lore-respecting manner.