The Miam Miam Dodo maps are actually pretty good! They are not topographic maps, but they are to scale, and show crossroads. They do not show the "big picture," though. Tobacco and news stores, often the same thing, used to have a blue colored series of Michelin maps that were great for walking and biking. They seem to have disappeared, but there may be replacements.
Maps in MMD are quite detailed for the GR65 route and about 1 km either side of it; one covers 3 or more map-pages in the course of a single day's walk (MMD is organized in two-page spreads, with a map-page facing an accommodation/services-info page). Although a topo map is a nice-to-have, it is by no means essential for walking the Le Puy route. The FFRP walking guides in French, with topo maps, are published full color on coated paper and so are a bit heavy; so there are three guides to cover the entire route Le Puy - SJPP.