I was a trade guild GM in 2015 and 2016.
Back in those days, trader flips happened early Monday morning. Like 5 or 6AM. And back in those days, maintenance was weekly, not every two weeks, and almost always on Monday mornings. I.e., trader flips almost always happened during maintenance.
Also, back in those days, you could place only one bid. So you'd wake up early on Monday, race to log on as soon as maintenance was over, so you could see if your one bid failed or not, and if it did, scramble to find an open spot.
These days, maintenance happens only once every two weeks. Usually on a Monday, so it usually won't conflict with trader flips. And even if it did, the whole point of having so many backup bids was so that you weren't reliant on the success of a single bid. And if all your bids failed, there's not much you could do anyways these days since open trader spots are almost unheard of now, due to people being able to make bids on so many locations. Oh, and back then, everyone in the guild could see the gold history and how much was bid--that wasn't a secret--so bid spying was common and there was actually a good reason to make last-minute bids to counteract bid spying.
So, excuse me for sounding like a grouchy old curmudgeon, but what the hell are you complaining about? There's no reason to be around for trader flips like there was 7-8 years ago.
So is there a specific reason why maintenance has to be on trader flip day? Maybe change it back to Sunday evenings?
That would be AWESOME!