Longer cues are not really made to be used on larger tables, the snooker cues are no longer than, and in fact are now usually shorter, than cues used for pool. Long cues do have an advantage for reach and taller players but I don't think cue makers make their cues based on the table size they will be used on.
The shafts do not look like they were made for snooker, they could have just been made thinner for player preference, a lot of people like shafts under 13mm, they also could have gotten thinner over time depending on how old the cue is. Snooker cues have much smaller tips and generally use a conical taper and short ferrules.
, I am an average height player always use a cue extension on playing on anything over an 8ft table. Longer cue is a huge help on larger tables