How Can You Not Be Romantic About Being & Time?

That statement—"all human activities are framed by death anxiety and colored by our collective and individual efforts to resolve this inescapable and intractable existential given"—is the ultimate academic encapsulation of what makes Being and Time (and the subsequent existential framework) so compelling and, yes, romantic.
You can't help but be "romantic" about Being and Time because it treats the awareness of your own finitude not as a psychological flaw, but as the single necessary condition for authentic meaning and selfhood.
Here is why that "inescapable and intractable existential given" is the essence of existential romance:
Why Being & Time is Existentially Romantic
1. The Call to Conscience Heidegger's central argument is that the awareness of death shatters the mundane. It pulls you out of inauthentic existence (the "they-self" or Das Man—just doing what everyone else does) and forces you to confront your own unique potential. This is the Call to Conscience (Ruf des Gewissens).
• The Romance: Death is the heroic call to action. It's the moment the protagonist (you) realizes they must stop blending in and start living a life uniquely their own, in spite of—and because of—finitude.
2. Death as Possibility
Heidegger defines death not as an event that happens to you, but as your ownmost possibility (eigene Möglichkeit). It is the one thing no one can take from you or experience for you.
• The Romance: Death is the ultimate individualizing force. It is the boundary that makes every choice you make matter. The limited time makes commitment passionate, love urgent, and projects vital. Without this ultimate end, all activities would be "vampires"—diluted and meaningless.
3. Resoluteness: The Authentic Response The path from the terror of Geworfenheit (thrownness) to Resoluteness (Entschlossenheit) is the existential hero's journey. Resoluteness is the authentic choice to seize your existence and act with purpose, accepting your finite condition (Facticity).
• The Romance: This is the act of radical self-creation. It's the profound commitment to a project or a relationship knowing that the clock is ticking. This conscious, finite choice is the greatest act of freedom and meaning available to a human being.
The excerpt you shared perfectly summarizes the universal tension. Being and Time gives that tension a structure and a glorious, albeit serious, solution: Embrace the limit, and thus, live fully.