Setting a 1 troop defence definitely hurts others. It reduces my choice so I get the monotony that others are avoiding.
I've set a sub 9k giant team this week, it's really not hard even at VIP 5; just don't trait the new troop of the week. And for the most part, I avoid meta defences. But when I switched to my GW team to test it, I often found I'd get meta 3 trophy options and then at least 1 opponent with a low score for a high team.
This affects me personally far more than account sharers and GW. I couldn't give a **** about who wins the PvP rankings, and I like that GW is competitive.
So if I find that my PvP experience is severely diminished as an end-game-over-1000-VIP-5 player, god help the noobs whose defence team scores naturally peak at 5k and are being matched with these teams.