(Image credit: Tom's Hardware) Microsoft is further shrinking its Surface lineup of flagship Windows devices. According to a report from Windows Central , citing "sources that are familiar with Microsoft's hardware roadmap," the company is no longer manufacturing its budget-focused Surface Go 4 and Surface Laptop Go 3 , and doesn't plan to follow them up with new devices. Over the last few years, Microsoft has discontinued many of its most interesting designs, including the powerhouse Surface Laptop Studio , the Surface Studio desktop, Surface Headphones and Earbuds, the Surface Book, and the Surface Duo smartphone. The entire line has been simplified down to the Surface Pro and Surface Laptop, with the Surface Laptop Ultra coming later this year with Nvidia's RTX Spark. (Microsoft's RTX Spark Dev Box is also Surface-branded, but isn't consumer-facing). But the Surface Pro and Surface Laptop each come in more sizes than ever. The Surface Pro comes in 12- and 13-inch sizes.…