Ok. I will write it again if you do not understand.
There are no good boes at the start weeks. Also, 1-2 boes will no make big difference (as any boes came into minor slots like bracers/belts etc). For example,
difference between 400 and 445 bracer is like 40 0-450 dps (in case of ideal rotation, any mistakes will make difference less - like 100-200 dps).
Not a big deal.
Bis trinket now costs like 3-5k on AH, not a big deal either. Anyone can afford it. Besides, you can't buy really bis trinkets, it often drop from raids/m+, which you forced to do by yourself, because there are no gold carries at the starting weeks.
He can't spend ALL time for progressing - rep/AP farm is the thing ant the start of xpac/patch, and you
can't skip it for gold.
While doing rep/AP farm, you will eventually get some gold from emissary chests/WQs/etc.
I got something like 2 mils of gold from the beginning of BFA without speniding a hour for gold grind (I hate grind actually, and can even pay for skipping essences grind on alts, but cant, because there are no p2w unfortunately).
Er... why?
Any good player have a pack of gold on his main and easilly can afford bis trinket.
Even if its a fresh char - you will have something like 20-30k after leveling.
Why you need to use consumables outside of progress? For killing trash mobs on WQs?
You don't need to farm gold nowadays, its not classic now )
You will get enough of it farming rep/wqs/AP-thing.
Two points:
1. There are NO carries for gold at first weeks of xpac (because they need to farm gear for theirselves before they starts carry).
2. There are a couple of communities targeted to m+ completion - any good player knows about it and have no prob finding a good party.
I geared some alts to 440+ - its not a big deal. For example you can go straight to 10 key having full benthic gear, its enough for doing it in time. If you have skill ofc, not a shitty dps.