The internal solver lets you install/upgrade/remove using a pattern, like opkg remove python-*. This doesn't work on the libsolv backend.
Correction: the internal solver will only let you use globs for remove operations. Commit fbc324599e77836826acc5bcd0f30bebdcf03d97 enables globing for remove operations for the libsolv backend, achieving parity with the internal solver. Globing for install/upgrade still needs to be implemented.
Fixed on commits 04ae2f69ac553949fbeaeed064a926605401cc4c & a73c692b8d2502d02f4cb62daca8ba52b942141b
Using this ticket to track the work needed to get the internalsolv to use globs for install/upgrades.