Looks like Visio 2021 is getting new default fonts!
https://www.microsoft.com/en-us/microsoft-365/blog/2021/04/28/beyond-calibri-finding-microsofts-next-default-font/
That also means new diagrams will look a little different, fonts have a significant impact on the overall look and feel.
Looking forward to seeing some Visio diagrams with the new fonts, to consider the overall visual impact (and which of the default fonts I like best in diagrams overall), maybe not the Calibri replacement but another font.