It's very easy to observe the changes you mention: A lack of energy in activities in the short term, which you can control with diet adjustments. In the long term (over the course of a few months), you should be tracking your weight chart and reducing your intake.

The body can adjust to caloric deficits, but not so much that consistent effort over weeks will be blocked.

I think it's necessary to mention how to deal with these changes, whenever they're mentioned.

Yes of course. The impact of caloric restriction on metabolism however is FAR overstated as we know from the available literature. "Starvation mode" is largely relegated to pseudo science at this point and most of the reduction in metabolism you speak of is due weight loss itself and a small reduction in NEAT.

But yes the human body is a complicated system effected by hormones, and other individual factors.

However it is important for the layman to understand the basics. It VERY rarely helps people struggling with weight loss to gloss over the basics and talk about metabolic adaption or provide other "excuses" like PCOS, hormones or starvation mode. They miss the forest for the trees.

I agree. This nuance is overblown and the knowledge to notice and deal with cues from the body aren't brought up whenever people mention this, which I think is really unhelpful.