Whenever I do solo dev work, the feature that always takes the longest and tends to require the most work to get something playable by actual players is the UI. Building out the gameplay features is always a lot of fun, but you can only go so far by fiddling with variables and restarting. There's always a significant amount of UI groundwork that needs to be done in order to make a game playable at all, just because of how much information needs to be conveyed to the player.
Whenever I build support into a game for different characters, cars, tracks, loadouts, etc. then each of those options needs its own way to choose that option from a list of available choices. That display must show a lot of information to the player so she can make an informed decision (e.g. this car has fast acceleration, that one has high top speed, this other one corners well, etc.), which all requires an intuitive screen layout, information presented, and so on and so forth.
Small-team dev also tends to build more system-driven games because it's more dev-time-efficient than creating single-use narrative-driven content. The tradeoff is that system-driven content also requires significantly more UI to convey all of that information to the player. This means games with a lot of options for players to choose tend to require a lot of UI work, which is something many hobbyists don't think about when starting.
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