The Doctor's opinions about the machine being alive have changed over time, with Edge of Destruction being a major turning point right near the start. Then you've got The Doctor's Wife as the last big turning point, which pretty much cements the idea, in the Doctor's mind at least. The Doctor considers the Tardis to be alive and knows that the Tardis considers others Tardises to be her sisters, so whether they are actually alive or not, it doesn't ring true that she'd be so cavalier about sacrificing them.Classic WHO took the time to spell out how the TARDIS still thinks and acts as a machine and despite having an allusion, is not alive in any actual sense.
Also I don't think Doctor Who's ever had a showrunner who's seen all of it, (you can look at how badly Steven Moffat wrote the First Doctor to see how far back his knowledge went), but I watched through the classic series for the first time four years back and it took me two months watching three-four serials a day! So it's definitely possible for a new showrunner to watch all of it, but I could definitely forgive them if they only decided to watch the stories that led up to the ones they're writing. But seriously, if you're going to write for the First Doctor, watch a few of his serials first.