Why door to door canvassing has a long history
Launch library · evergreen read

Speaking with someone directly at their own door has long been valued in campaigning because it allows a genuine two way conversation, letting a canvasser respond to specific concerns rather than delivering a message that cannot adjust to the person receiving it. That flexibility is genuinely hard to replicate at any real scale.
This personal quality has kept canvassing relevant even as other, faster communication methods have developed, since a direct conversation still tends to build trust and shift opinion more effectively than most impersonal forms of outreach. Presence, it turns out, is difficult to substitute for entirely, no matter the technology on offer.
Canvassing's labour intensive nature has always limited its scale, which is part of why campaigns have historically combined it with broader, less personal methods, using direct conversation where it matters most and wider communication to reach everyone else. That combination has proven durable across many different eras and causes.