Actually Barry it's cool until you have to use one of those tracks when you have plugins on it.
If you have a ton of plugins on the lead vocal track and the vocalist needs to come in and sing an additional line, the second that track goes into record all of your RTAS plugins are put into by-pass.
It's the nature of RTAS.
It's also one of the reasons I hardly ever use that format.
BTW, Massey is TDM and charges less than anybody for his plugins.