You probably shouldn't spend your day calculating trade-offs for every purchase you make. Theoretical value added is still just theoretical value, but cash outflows come from finite cash.
The best values and leverage are found high repetition or high scale activities. For example, everyone has to commute to work every day. Considering moving the office closer to a train station/highway/bus terminal so that each of your employees shaves off 15min of commute time is a highly leverage-able decision.
No, you shouldn't, but you can still calculate more. For example, do one calculation up front about 'should I in general take the subway or a taxi?' and then follow your answer for the next couple years; for maybe a few minutes of work, you save money-time for perhaps thousands of days to come.
In general, the best space-time tradeoff will never be 'all time' or 'all space'.
The best values and leverage are found high repetition or high scale activities. For example, everyone has to commute to work every day. Considering moving the office closer to a train station/highway/bus terminal so that each of your employees shaves off 15min of commute time is a highly leverage-able decision.