Is your objection just that the default canvas size is A4 paper instead of let's say 1080p? Or is it that the canvas is finite at all?
Despite being "infinitely" scalable, SVGs still have a "native" scale and coordinste system, so it would be far more disorienting and error-prone to present the user with a blank infinite canvas instead. The default being paper size is a bit unusual since Inkscape isn't very suitable for print work (color spaces and all that), but these days you can pick a starting size in the launcher anyway, so most of the time when starting new projects you don't even see thr default.
Despite being "infinitely" scalable, SVGs still have a "native" scale and coordinste system, so it would be far more disorienting and error-prone to present the user with a blank infinite canvas instead. The default being paper size is a bit unusual since Inkscape isn't very suitable for print work (color spaces and all that), but these days you can pick a starting size in the launcher anyway, so most of the time when starting new projects you don't even see thr default.