This page ranks base products in an order nobody else uses: easiest to hardest to physically use, with coverage and finish as secondary considerations. That is the right order if getting the product out of the container is the part that has become difficult, and it is a question every other foundation roundup skips.
The ranking falls out of four properties. Is there a dispensing step? A compact and a stick have none — the product is simply there, and you touch it. Everything else requires getting product out before you can apply it. How much force and what kind of grip? A broad flat pump top accepts the heel of your hand; a dropper bulb requires a fingertip pinch. Can you do it one-handed? A stick and a compact can; a bottle you must hold while pumping with the other hand cannot. What happens if your grip slips? A compact stays shut. An open-neck bottle empties.
Applied consistently, that gives: powder compact easiest, then twist-up stick, then pump bottle, then screw-cap tube, then squeeze tube, then open-neck bottle, with dropper hardest. The coverage and finish follow along for the ride, and conveniently the two easiest formats are both genuinely good on mature skin — a baked powder diffuses light nicely and a balm stick suits dry skin.
The other half of the problem is application, and it is solved by one object. A damp sponge held in the palm needs no grip strength, no pinch and no fine finger control, and it presses product onto the skin rather than dragging it into lines. For this audience it is both the most accessible tool and the best one.
A note on what is not included: nothing here involves decanting product into another container, taping anything, or improvising adaptations. Those can work and they are personal; this page is about products as sold.