gimbal, TCD: fair enough
I would argue that most of the games you mention were made in a transition period. Indy 4, for sure, still has text intended as text. I never played the later talkie version, so I can't really judge. Sam & Max was still released on floppy disks without full voice acting, but surely this was already fully taken into account when written. For Full Throttle, no version without voices even exists, i.e. it is clearly written with real voices in mind. I fully agree, that game would be
much worse without the voice acting!
dreadnought: the Amiga KQ1 remake (as all those lazily ported Sierra Amiga games of the time) has a mouse pointer to move around, but all actions still have to pass through the text input parser. In any case, I strongly discourage using the mouse in these games. The pathfinding routine is awful. It will make you die even more often! The SQ1 remake, on the other hand, is "full" point & click.