I mean yeah sure having 100% uptime is better, but compared to other sets, besides Mechanical Accuity, it actually has an extra 3 secs when you switch to the backbar and when you switch to front bar you have already enough dots to instantly get it to 5 stacks.
Compared to other sets like Hundings or Spriggans you lose all thw 5 pieace effect as soon as you switch.
I use TFS front bar and on combat metrics I have 78% uptime 5 stacks and Im doing my rotation completely normal not speeding up the bow rotation.
when Summerset hits I plan to use it front bar with Arms of Relequen set on both bars since this set needs 20 stacks.
Mechanical accuity will be less reliable and stamina will lose a bit of penetration in summerset