Ridiculous, Jackal isn't just annoying for roamers. It's annoying as anyone, that wouldn't change if we went back to the 'magic' era of people cowering in a room holding an angle for 4 minutes.
This pretend world where roaming somehow changed the game for the worse blows my mind: If you don't have roamers, it means your vertical play is all completely uncontested, which means that the defense is fucked just because we know how to play vertically now or attack from other angles now too. Like...it works on house, cause hosue is the size of a postage stamp, but imagine somehow not having anyone roaming on like, even something like Bank, a relatively unchanged map, the attackers would just have insane control over every site no problem. It's not because Ubi 'lets' people roam, it's because roaming is the natural counter to attackers doing more than just blindly running into the angles you're holding.