On the basis that they probably had to put the bonus tracks somewhere, I kind of 'get it' that they are here, but I am just not really that fond of those 2 tracks...
'Medley' would have been totally wrong for a 'Voulez-Vous' album bonus track, and I am glad they did not put 'Crazy World' on the 'Arrival' album remaster.
I remember when 'Gimme Gimme Gimme' was added to the 1997 remaster of the 'Super Trouper' album CD. That did not feel at all right, and I am glad that decision was re-considered with the track moved to 'Voulez-Vous'.
The other one I know some people debate is 'Fernando' - it fell between the 'ABBA' and 'Arrival' albums, after all - but given in Australia and New Zealand it did appear on 'Arrival' in 1976, I think it kind of makes sense...
For decades it seemed like Fernando was the end of “ABBA Part 1” as it appeared on the original Greatest Hits, had a track from the ABBA album as a b-side, and originally appeared on Frida’s 1975 solo album, but yes, as it was started at the same time as Dancing Queen, I’m prepared to accept it as the beginning of “ABBA Part 2”. The final chapter, “ABBA Part 3” began with The Winner Takes It All.
"ABBA Part 4" is about to start though, so "Part 3" won't be the final chapter anymore... ;-)
In fairness, this new phase is more likely to be an epilogue.
Or an encore that the audience has been clapping and stamping their feet for, for 38 years. Everyone had given up and were about to set off for home, then suddenly, the stage lights came back on two years ago.