pineteam
Remember if you don't set TOGA, at least once, you won't have the go around phase. Not a big deal if you expect radar vector but better set TOGA at some point before the runway threshold
It is a big deal. I think you are mixing up GA mode and NAV mode. You must hit TOGA otherwise the FDs will take you down as they will remain in approach mode. There were at least three incidents of this nature. In the worst case the aircraft in poor visibility was 14 feet on the runway before they ignored the FDs and pulled up. When below the FCU altitude TOGA and back to climb as you suggested is a better option. Discontinued approach is not a smart option it will sequence the airport creating extra work plus too much thinking. TOGA is better option even if you were above FCU altitude TOGA will still engage SRS only it will not have target altitude. You can push VS to change SRS set a target altitude and pull climb and cleanup.