Would "Sgt. Pepper's" be a better album if.....

I'll bet Ringo wishes all The Beatles albums would be remixed. When he heard the first album, his response was "Where's me kick?'. George Martin was not a Rock 'n' Roll producer, and put Ringo's bass drum waaay down in the mix, giving them a more "Pop" sound than they imo should have had . The Beatles started as a Rock 'n' Roll band, and turned into a Pop group. A rather good one ;-).

" Would "Sgt. Pepper's" be a better album if..... "

well, its not going to happen, so guess it really doesnt matter now does it?

Different Agoners would keep or cut different tunes.  There's no absolute answer, no consensus, on this.  If you put SFF and PL on this LP then what happens to the Magical Mystery Tour LP (without those two very strong tracks)? 
When I'm 64 is a fairly lightweight song (he wrote it when he was 16) but IMO they managed to make a good track of it.  And it is very popular.

Honestly, they would have been better off not doing MMT and gone on to the White Album.  MMT is the weakest album of their discography.  I'd almost say it was an album they released to satisfy the bean counters at Capitol, etc...

@sbs38
I think the 50th anniversary edition of Sgt. Pepper's that Giles Martin  produced was released earlier this year. Here are details, https://www.beatlesbible.com/2017/04/05/beatles-sgt-pepper-50th-anniversary-edition/

I believe you can stream Giles' version of Sgt. Pepper using TIDAL Look for the album artwork with the word 'DELUXE EDITION' on the left hand side. It's noticeably better sounding than any other Redbook CD versions I've heard and miles ahead of the mono CD version that sounds lifeless.