I'll leave it to any designers / users of VCA automation to comment on the quality
VCA automation has some operational benefits - eg 'Trim' mode where operation can be around the '0dB' point for maximum control resolution.
And I recall an engineer expressing that when he moved a fader on a session at 1am he wanted it to still be there when he went back to it.
Different ways of working and preferences. This was at a top end UK studio complex so not restricted to bargain basement stuff.
Little or much VCA always affect on sound ,
depending on the chip type and how circuited .... ,
it can help in terms of automation and economically ,
but always affect on sound ,
.... and still haven't met anyone "happy" to use vca for rec and mix in studio ,
maybe some last generation vca ic will have better features
than the previous ones ,
making them a little more acceptable ,
but still don't hear about it,
perhaps because now the consoles for live often equipped with vca are digital
somewhere a thread dealt with the replacement of DBX2151 with That 2180
what better substitute , with much better performance ,
and that for analog consoles of a certain value ,
specially the hi range of analog consoles for live ,
the modification would make sense ,
even if the cost of the modification ,
more for the work needed than for the cost of the vca , was not low.