How so?
Wales rugby and football have their own leagues but they're ****. So their good teams are in a league with another country.
It is essentially the same thing for the Italians in the Pro 14. The least **** Italian team in a foreign gets a champions cup place. That it clearly the same as the least **** welsh team in the Premier League getting a Champions League place
Not quite the how it happened - money was always the key factor for both, mixed in with a bit of historical rivalries / geography.
In football: The majority of the Welsh sides in the English pyramid (Cardiff, Swansea, Newport etc.) are all either big cities/towns in the south with easy links to western England, or are from the border areas in mid /North Wales, so when their clubs were set up they generally played in the local area leagues with English sides. Also when the proper English pyramid as we know it (or at least the pre-Premier League version) was set up, there literally wasn't a "Welsh League" to join at the time anyway. When one was eventually set up in 1992, all Welsh sides playing in the Football League were invited, but naturally they declined. This was most likely due to them being in an established fully professional league system, which is able to reward success (getting to the Premier League) with bags of money, so the fairly financially vulnerable semi-professional Welsh League set up wasn't exactly an attractive alternative.
Also your Cardiff / Swansea in the Premier League comparison to the Italian Pro14 sides doesn't quite work, as if either were to qualify for the Champions/Europa League, they go as representatives of the English FA rather than the FAW (which makes me feel a little sick, but oh well) - much like how Italian sides used to qualify as representatives of the FIR, both before and after their entry to Pro12/14 Rugby.
This is because FAW affiliated sides have their own distinct European qualification route via the top level of the Welsh Leagues / FAW Cup.
Which leads me to my main question - those of you against having the top Italian side qualifying, would you feel the same if they were back competing in the Italian League and having to qualify that way? If I remember right the top 2 sides in the Italian league (almost always Treviso and Viadana/Calvisano) automatically qualified, plus the third placed side playing off against the 4th placed Welsh region.