The question seems to ignore the simple fact that manufacturers are catering for the entire diversity of the population, not particularly on section with a very different build; that is to say equipment that will be a treat for some people will be a pain for others. It is impossible for manufacturers to make everything suitable for every person, anywhere and all the time! That said, MONT and One Plant offer options for extra long sleeping bags; I think Sea to Summit does too; otherwise, a bag that is just right in so many other areas can be professionally modified.
I have more trouble with simple things like gaiters that are made difficult from the style of material and closures. Sea to Summit QUAGMIRE gaiters are a case in point. They are enormously stiff and unyielding to put on, and the uber-tacky velcro closure can get itself stuck on other clothing, particularly gloves and mitts (I wear cyclist mitts to protect the palms of hands from abrasion and the backs of hands from stinging nettles). These gaiters are otherwise very good in every other respect, including importanly, durability. I've owned them for 6 years and they are yet to show their age, just their propensity to be damned difficult to get on and catchy with anything they come into contact with.
Never had a problem with my Sea to Summit down pillow. Scrunches up to next to nothing and if per chance it is a bit low for the purpose, I roll up a jumper to place under it.
In its prototyping of shellwear in the 1980s and 1990s, Paddy Pallin (to use just one early example) was given feedback from technical, alpine and rock climbers about the placement and orientation of zips on shellwear and jumpers/technical shirts. The point that
@headwerkin makes was founded in those distant years and we tend to take it for granted when so many products do feature it as a learned norm — but not it's not universal! Zips closing to the back were also integrated by MacPac and ArcTeryx; of course placing them at the front may expose them to ensnaring/snagging and opening, potentially spilling gout small pieces of equipment, food or something else that is critical.
One other gripe: piezo stove lighters
Absolute garbage and nowhere near the worth being asked for in shops. I carry water- and windproof matches with me.
Overall, I don't quibble with equipment; I choose carefully what is fit for my needs and sizing and look after it; weaknesses or something, somewhere that niggleme may take years to actually spur me into doing something, or I'm more likely, as I am at this age to just "let it go and forget about it" andn get on with what needs to be done. Walking and exploring.