Of the 61 fights that Clay/Ali fought 29 wouldn't be allowed nowadays as heavyweight because one or both opponents were below 200 lbs at the time of the bout. In other words they would run as cruiser fights (or below) and Klitschko wouldn't be allowed to stage them.

Of the remaining 32 fights Ali lost 4.

Of the remaining 28 fights Ali fought 10x against opponents LIGHTER than Eddie Chambers (Wladimir Klitschko's lightest opponent), thus today's fans would shout "they should move down to cruiserweight" and "it's proof of how the division sucks" or what a mismatch it is.

Of the remaining 18 fights 2 wouldn't be allowed for medical reasons: Joe Frazier was blind on his left eye and Cleveland Williams was gunshot. Another proof of the "dire state of the division"

Of the remaining 16 fights Ali couldn't KO his opponents in 10 fights (within 12 rounds) thus they would be "proof of how featherfisty Wlad is with a KO'ratio of 38%" and that "Marciano would KO this bum Wlad in 1 round"

Of the remaining 6 fights 1 was a bum ·Charley Powell (25-11) which would be another proof for the "worst era in heavyweight boxing"

Of the remaining 5 fights 2 were against guys coming off a loss (Ron Lyle, Alvin Lewis) and fans would accuse Wlad of "cherry-picking".

Of the remaining 3 fights 2 were against a cruiser-bum beater (Sonny Liston) and fans would speculate about how the mob or Wladimir's radical Muslim friends have illegally influenced the outcome, since both endings (shoulder injury, phantom punch) were highly suspicious. Fans would complain that Sonny Liston didn't come to fight since he chickened out as soon as he saw fit.

The remaining 1 fight was against an opponent who gassed in the heat and sultriness of the rain season in the rain forest (George Foreman) and fans would shout "Lame, nowadays heavies cannot go 15 rounds anymore like Joe Louis".

That's approximately how Ali's record would be seen nowadays.

There is an even simpler nutshell, that sums up even better the abysmal state of Ali's era:
A guy with Parkinson's (Muhammad Ali) fighting against a 6-0 cruiser bum (Spinks, 197 lbs) for the unified heavyweight title…. and losing (and then avenging).

THAT's all you need to know about The Golden Age of Heavyweight Boxing.
Probably the lowest point in all heavyweight history!