when the T7 entered service there was also a logic problem if they werent selected off and on in the correct sequence which could give you fault messages which the crew couldnt clear. This eventually got modded out so not normally an issue. The fluid transfer is small but on an aircraft that has no leaks will eventually cause level issue's . Not a problem as there is a tolerance and the engineer should be looking at it before you do, and then you check before you pressurise anything. Boeing have the 'OF' and 'RF' prompt if overfull or low. Basically good practise but not critical.