this is how it was during vanilla. some of the best gear was from pvp and some was from pve and most people ended up wearing a mish mash of the two, especially if their pvp and pve sets had good 3-5 set piece bonuses or a really strong unique glove/boot bonus power, etc. if the pvp sets they put out were weaker than raid gear, no one would have bothered and vice versa. they obviously designed the pvp sets to be upgrades/sidegrades on purpose so people would do both pvp and pve.
Some pieces can actually best in slot as individual pieces (legs, shoulders, boots are very good too) and the 2 piece bonus is crazy too. Chest is also insane for people who don’t want to waste a thousand hours grinding savage glad.
If PvP is your goal I could see pursuing the chest but I’d expect SGC to drop before the amount of time it’d take you to grind the pvp chest. Both of those items are decent but I wouldn’t expect someone using a replacement level item from raiding to do greatly less DPS.
Will it be possible to get the good gear without BGs? I feel like the amount of honor/hour from WPVP won’t be enough to get the highest ranks - or will it…?
Yes, some classes can get some good peices from PvP and the 2 set. But MOST will use BWL over it in MOST slots, likely way more than the amount of people that get to Rank 10.