It would be very convenient to have an explicit argument for building vignettes for the family of install_*() functions. This would be similar to what was available via the build_vignettes argument in the pre-remotes (before version 2.0.0) version of devtools::install_*(), which still survives in the current devtools::install().
Although one can manually specify build_opts = c("--no-resave-data", "--no-manual"), an explicit argument is particularly useful when describing e.g. how to install a package from GitHub in its README. One typically wants vignettes to be available to the user installing the package, especially if the package is not on CRAN. In this regard, an explicit