I grew up in the 70s - I know more about English football in the 70s than any decade since.
And we are back to stats again -
Let's look at English football in 1974 -
The European Cup was dominated by Ajax and then Bayern Munich from 1970-1976 (it wasn't until Bob Paisley's great Liverpool team of the late 70s and early 80s, coupled with Clough's Forest for a couple of years, that England began dominating European football) - the Cup Winners Cup - Chelsea won in 1971 and then an English team didn't win again for the rest of the decade - UEFA cup - Spurs won in 1972 and Liverpool in 1973 and 1976, but it was dominated by German and Dutch clubs.
Furthermore, England failed to qualify for the World Cup in 1974, the European Championships in 1976 and the World Cup in 1978 - at a time when there was only a handful of non-British / Irish players in the First Division.
Football fans in the 1970s looked to the total football of the great Dutch teams (club and international - Cruyff, Haan, Jensen, Krol, Neeskens, Rosenbrink, Rep, the Van Der Kerkoff twins) and the great German teams of this period (with the likes of Mayer, Vogts, Beckenbaur, Netzer, Heynckes, Overath, Muller, Hoeness, Bonhof) - there was nothing comparable in English football.
But more importantly - 1974 was pre-Bosman ruling - Foreign players didn't play in English football. The 22 English teams had a combined FIVE non-British / Irish players in their squads - and with the exception of Clyde Best (Bermuda) and Colin Vijeon (South Africa), the others were reserves. If European/global players could have signed for English clubs (again pre-Bosman) then there would, at best, have been three Irish players playing in the first division (Giles, Heighway and Don Givens - and maybe Brady would have got some games for Arsenal, given his age). Indeed several Irish players who were with second division teams would have probably found themselves down a further division.
Johnny Giles knew how to manage a football team - and Leeds would have become a dominant European team if Giles had been made manager instead of Clough. With Ireland he took a wide variety of footballing talents from three different divisions, many of them bit-part players, knew how to use them and made them significantly better than the sum of their parts. More importantly - he made them very organised, very difficult to beat and bad luck (and widespread corruption in international football in the 1970s) deprived Ireland of qualification in more than one occasion in this period. In 1976 Ireland came second in a Euros qualifying group with Russia, Turkey and Switzerland, missing qualification by one point - and the Irish team were robbed in Russia. For 1978 we were in a qualify group with France and Bulgaria and were ambushed by a corrupt referee and linesman in Sofia. Ireland dominated the game, had a perfectly good goal ruled out for offside, Bulgaria were given a dodgy goal and Mick Martin and Noel Campbell got sent off in a game where Bulgaria kicked lumps out of the Irish players. This was at a time that only one team qualified - and there were no play-offs or Nations League spots - where international managers might have 3/4 games a year and Giles was also player-manager of West Brom at the same time.
Kenny has had three years where he was set-up for the job and nearly four year in it (with now 37 games - in the 8 years Giles was in charge he had 37 games). But Kenny has done the exact opposite of Giles (and Charlton, McCarthy, Kerr and Trapatoni) - the Irish team is disjointed, disorganised, have no idea what they are supposed to be doing (except pass the ball around between Bazunu and the two central defenders), and have zero fight in them - they couldn't win a punch up with a paper bag - and that is something that even Steve Staunton's team could have done. Now - the Irish squad is not at the standard as previous Irish squads - the Charlton era or the McCarthy 2002 squad - but we are better than being dominated at home by the likes of Greece and being beaten at home by Luxembourg and losing to Armenia - 5 wins in 25 competitive matches - against Azerbaijan, Luxembourg, Scotland, Armenia, and Gibraltar - there hasn't been a worst performance from and Irish team in 100 years - and we have had some really dodgy squads who had an FAI committee selecting the team for the first 50 of those years.
The problem is that the FAI get to also pick the next guy - and we know what the FAI are like.