PSD and doing (visual) design upfront is analogous to bloated (not code, probably outdated by time it is done, disjoint to actual app/needs, not quick to change

PSD and doing (visual) design upfront is analogous to bloated (not code, probably outdated by time it is done, disjoint to actual app/needs, not quick to change/adapt, etc.) specification and (non-visual) design upfront that is largely viewed (for many types of software development) to be a complete fail. [Edit: but if it works for you, great]