You’re assuming every IT department has some sort of unlimited budget to go out and refresh all of these equipment to something that is more practical and makes more sense. And even if Raspberry pis are cheaper, the labor required to not only having to change all of these devices are usually more expensive, but also not every IT department has field tech staff that know anything about raspberry pis, which are far more niche than windows terminals.
You’re assuming every IT department has some sort of unlimited budget to go out and refresh all of these equipment to something that is more practical and makes more sense. And even if Raspberry pis are cheaper, the labor required to not only having to change all of these devices are usually more expensive, but also not every IT department has field tech staff that know anything about raspberry pis, which are far more niche than windows terminals.