A lot of it is what the bass & drums were arranged/written to do in the solo. In my classic rock band we do Led Zeps Dazed & Confused, like them we don’t have a rhythm guitar but there’s no drop when the solo kicks in due to the arrangement and composition, if anything the song goes up (shows how clever they really were imo).
In songs which were written to have 1 or 2 rhythm guitars as well as the solo then just lead and bass will be a drop, no getting around that.