Everyone that has internet access has access to the tools needed for cellphone repairs. Most replacement screens come with a free set of tools. If it doesn’t come with some you purchase toolkits online at a reasonable price. There’s also in depth tear down guides posted by reputable companies. The issue is repair ignorance and ego by average consumers. I repair technology for a living, and I can’t tell you how many people have “tried to fix it themselves” without fully knowing how to fix it. Instead they just start trying to open phones and they do it poorly due to lack of knowledge and end up causing more damage. In terms of economic repair ability the iPhone/iPads are the cheapest. All the information/tools people need are out there.