The disposition of funds is in the hands of district-level folks who also make decisions about the proportions of funds spent for hardware and for software. The few times I've seen computer furniture in the budget is when a new school is being built and capital building funds are being used to purchase the technology. Otherwise we're stuck with tables and chairs that used to be stored in the furniture warehouse. Look at these pictures, paying special attention to kids' posture. Even the simple keyboarding programs tend to have a section about correct chair and table height, and about how the forearm is supposed to be at right angles to the upper arm when fingers are poised over the keyboard.
Screen glare is another problem when rooms have windows and inadequate window coverings.
If so, there's a major glare problem which can harm kids' eyes after extended use. These folks have the right idea. They've used adjustable height chairs. That is, no matter how high or low the table, you can sit correctly if your chair is adjusted properly. Others are so short that their legs dangle when the chair is raised.