Ah, but the majority of journeys on all 3 legs usually connected in the past (subject to traffic of course) and in the recent past through fares have been available. Are they now treated as separate services due to time keeping? If so then maybe re-numbering and re-timing to reflect actual journey times would be a better option. The alternatives offered between Rosslare and Waterford may not connect, and in addition, it's another leg added on, who's going to try Rosslare to Cork over 3 journeys when it used to be 2, and worse still Tralee over 4 journeys when 3 was bad enough even though on paper they connected?
That is how NTA/TFI have chosen to administer bus services in Ireland.
Dublin city services, run by Dublin Bus and Go-ahead Ireland to routes directly controlled by TFI currently in the middle of a very long drawn-out network redesign.Fully integrated train/tram/bus fares based on a single connection fare with day/week capping.
Outer Dublin region, mostly Bus Eireann with a portion franchised off to Go-Ahead Ireland with a separate fare structure to Dublin City, some bus/rail/tram fare integration day/week/month tickets with zones but still heavily dependent on single fares.
Independent commercial operations of various sizes, quality and usefulness, some frequent fast long distance coach routes, some infrequent rural and local town services and everything in between, all run strictly for profit, many with timetables laser focused only on serving times where they can guarantee high custom (peak-only commuter and Friday/Sunday college routes). Fares operator specific only.
The shrinking remnants of the once comprehensive Bus Eireann Expressway network, hobbled to now run as a standalone commercial operation that has on many routes been unable to turn a profit. Fares mostly single/return only, connections within Expressway available and still some limited overlap with other Bus Eireann and Irish Rail services only through Taxsaver scheme tickets
The non-commercial "PSO" parts of the former Bus Eireann network, City/Town routes and wider commuter networks outside Dublin, infrequent rural routes (many now being replaced by more frequent local-link), long distance former Expressway routes not deemed commercial mainly by the absence of competing independent operators. Some zonal fares focused on Cities, single/return outside these regions.
Local-link services, a mix of scheduled and demand based routes, some reasonably frequent regional routes in amongst them. All run through a dozen or so local offices with all services contracted out to varying degrees of professional standards. Strictly single/return fares, no network tickets at all. No inclusion in Bus Eireann based town region zonal fares
Connecting Ireland town services, subsidised franchised town services in places with no previous (or comically poor independent) service, generally good timetables (early moning to late night 7-days). mainly single/return fares within town service only.
A handful of standalone TFI routes, mainly fill-ins where commercial services withdrew or no link existed. Standalone fares, even ones that are close to or within zonal networks.
If you find navigating journeys and fares that involve multiple layers of bus services difficult/expensive/impossible then contact your local TDs or TFI, it is their playground.