I'm sorry, Gambit? Relaxed?
Isn't gambit like the one time everyone starts going bat-sh** insane over attache-steals, macros, the overall struggle to get to round 200...maybe I'm taking it too seriously but the negative aftermath of the last gambit made its way here and someone quite literally Trumped it up.
That bit aside, I've had no complains with shards, other than the fact that it is pretty time-demanding and given its short nature, I can understand how people aren't particularly happy about it compared to other events.
As for the slayer bit, I've noticed that with almost every event there's an obtainable Event Gacha ticket and somewhere with it a card reveal. So long as you don't burn that during the event you got it, you can hold onto that ticket and carry onto the next event, where if you haven't reset your event gacha's SR spectrum, you're guaranteed to get the SR slayer (or could instead grab the R, nab a bundle of event gacha tickets and try again for the SR) Keeping up that cycle usually keeps you on the average line in the events.