The predictable 1970s home renovation list
Polybutylene supply lines. Installed in Florida homes roughly 1978 to 1995. Grey or occasionally blue flexible pipe, usually visible at the water heater. It is the single most consequential thing on this list. See polybutylene replacement.
Popcorn ceilings. Ubiquitous in this era. Homes from the earlier part of the range may contain asbestos in the texture, which the EPA treats as a testing question, which is a testing question before it is a removal question.
Terrazzo under the carpet. Often in excellent condition and worth uncovering and polishing rather than covering again. Lift a corner before you budget for flooring.
The electrical panel. Sized for a household with far fewer appliances. Some homes of this era also have aluminium branch wiring, which is a specific remediation rather than a preference.
Windows. Single-glazed aluminium that predates the current hurricane provisions. See impact windows and doors.
Why doing it together is cheaper
Every item on that list lives behind the same drywall. Repiping a house while the walls are already open, and running new circuits at the same time, costs a fraction of doing either alone later. That is the argument for a whole-home renovation rather than a sequence of separate projects.