I made this the other day.

Anyone want to team up to build a time machine and travel the future until the perfect utopia is achieved?

How about we team up and try to make this world better instead?

Nope, this redefinition isn’t necessary, it is a choice SI made. Nothing would have broken by keeping an exact relationship between amount of substance and mass, it would just have retained the interpretation of Avogadro’s constant from before 2019 (experimentally determined vs a defined constant).

… weighs one gram … An amount of hydrogen weighing the same amount has exactly one mole of atoms in it.

Not only was this never true - the sentence would have to have say “An amount of carbon-12 atoms weighing 12 times this amount has exactly 1 mole atoms in it” (far less elegant) – but not even this is true any longer after the fuckup in redefining the mole in 2019, after which all these relations between amount of substance and mass are only approximate.