Cartridge alignment is only one aspect of a turn table set up, however crucial.
Agree, the Feikert protractor is convenient for set up of multiple brands of tone arms and cartridges, at best, a handy tool for a dealer.
Now think about this , with all the work and expense involved with analogue play back and as critical as cartridge alignment is.
Why would anyone stop short of precisly dialing in their cartridge with a Feikert when high precision protractor's like the Wally or MintLp are available?....Again I refer you to member Stringreen's thread on the MintLp.