...I don't expect a reviewer to hold a reference system as a static set of gear/conditions forever. If they did, that might be interesting over time, and add consistency to the reporting. But, since they are only, for the most part, human, I expect them to add/subtract and hopefully learn as time passes.
I do expect them to maintain consistency for the gear being reviewed. And certainly, if something has been changed/added/subtracted, we should know about that. I would prefer that things be held constant.
I have been fascinated by photos of rooms and posts of new power infrastructure by some reviewers, wherein we get insight into the room or the power conditions...and it's really not good.
I find myself thinking: here I am sweating every detail, dedicated lines, cable management, vibration management, and the reviewer is running off old aluminum service cable, small-gauge (in size) wire...or has multiple speakers adjacent to the subject models, rooms crammed with stuff. Wow. I'm not the room/infrastructure police, but it really impacts my impression of the fundamental, foundational basis of the review itself.
I do think that the current trend of noting additional accessories, cables, power conditioners, room size/dimensions is a positive trend. I don't know that it tells me anything specific I can deduce about the component under review, but I prefer to make that judgement for myself, if the info is made available.