I'm Disgusting Dev - interested in CaaS (Codebase as a Service) solution and willing to increase knowledge of Dev Community about different problems and their solutions
Usually the most usable device might be defined before the actual development stage - when UX-responsible person/department goes for user research to understand major needs and issues of the user
knowing that, design tries to adjust fastest possible way of user journey - and if this is a PC, first design (and development) will be done on PC
If this is client-facin app (some online portal for everyone) - most probably it will be used from smartphone - so mobile-first comes there
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Totally depends on your core audience
Usually the most usable device might be defined before the actual development stage - when UX-responsible person/department goes for user research to understand major needs and issues of the user
knowing that, design tries to adjust fastest possible way of user journey - and if this is a PC, first design (and development) will be done on PC
If this is client-facin app (some online portal for everyone) - most probably it will be used from smartphone - so mobile-first comes there