Multiple viewpoints and experience can come from the analysis of someone else's work. You don't need to have conversations about snowblowers to take a snowblower apart and see how it works - and then improve upon it.
Mmm, it can to an extent. You can deconstruct someone else's work and understand it. You can go "oh, saw a useful thing in Bloggs work I can use here", but it is not quite the same as having a person with a different mindset look at things, because you still have your habitual ways of thought. It also won't help if no-one else has done the work - there is nothing to analyse. Or if Bloggs went through ten designs, and one of his rejected designs is what you really need, not what actually got put out. But having another person standing there to say "well, what if you turn it the other way up" because they are not focused on your aims with the thing, they are looking at the object as totally new to them, they are still parsing all the bits and pieces, and it is fresh to them.
For example, I once worked for a little while in an engineering company. They'd been having all sorts of design problems with a new complicated joint that had a lot of dimension restrictions on it. Top engineers huddled over it for weeks. Along comes a lab tech, who'd not been working on that project, she stops for a few minutes to look and listen and then she says "look if you take that bit out and turn it around, won't it then all fit?" Yes it did. Being decent souls they added her to the names on the patent. She said she got the skill from living in a small house and trying pack all her kids' stuff out of the way.
There is a very silly idea under the surface of this thread that information and cognition must be essentially verbal. Despite the long history of lone human beings making rather massive discoveries. A being unfettered by the belief that communication is essential to their endeavors benefits from all the other stuff the mind is capable of.
Great discoveries by lone genius is a bit different from a technological society - there has to be the way to spread the idea as technological includes the spread of things, not something in isolation. It is turning blue sky research into something with a function. Some lone geniuses tend towards, "oh, solved that, bored now, move onto something new" not "wow what a benefit it will be the rest of my species". Now some do start out with the idea of wanting to get in on the ground floor of say lightbulbs, but by no means all. Also development is built with the materials and tools to hand, which someone had to crop/create, probably not the same someone as the lone genius, and there have been brilliant ideas recorded (in writing) centuries before the material technology existed for them to take shape. People get very excited by aircraft design, possibly because you can see the results, without realising the stunning materials developments to make it possible. The industrial revolution was a long time growing and standardisation was one of the things that allowed technology to boom - everyone agreeing the length, screw thread and head pattern of screws for example. Whoever you bought your screws from, they'd fit.
I've worked in laboratories, both physical chemistry and materials science, and your technical support is essential to your success. They are the people you go to and say "I'm stuck, I need a thingy that looks a bit like this, will stand up to a force of 20kg and temperatures of up to 200C". I hadn't the skill set to make the thingy I need, they haven't the skill set to run one of my experimental rigs. If the one lone human can only work with the stuff they can make, and have to stop every time they need to make something, their progress will be far slower, or non-existent when they completely fail to make the thingy. Different people have different knacks for things.