'Does any digital step in the recording process ruin music forever?'
Yes
'What about digitally recorded music that has been mastered to Analog (Vinyl) - is this better than straight CD?'
No, they are worse than CD. You actually get the worst of both worlds.
'due to the inaccuracies in the mechanical cutting, presssing and cartridge needle pick up process.'
With a reasonable setup the 'inaccuracies' (to coin your phrase) is smaller than redbook anologue to digital and subsequent digital to analogue conversion.
Yes
'What about digitally recorded music that has been mastered to Analog (Vinyl) - is this better than straight CD?'
No, they are worse than CD. You actually get the worst of both worlds.
'due to the inaccuracies in the mechanical cutting, presssing and cartridge needle pick up process.'
With a reasonable setup the 'inaccuracies' (to coin your phrase) is smaller than redbook anologue to digital and subsequent digital to analogue conversion.