I think people really overate some operators based on casual gameplay.
Glaz is super useful when you're playing casual, where everyone is running around like a headless chicken, and they don't get to choose an objective location. But when they do, it becomes less useful.
So you might say Glaz is useful on the plane, but that's far less true when you realise that everyone in ranked picks luggage. In fact, almost every map sees the most activity on whatever area the defenders can get shot from the outside of the building, the least. Train Room on Kafe, Armoury on Hereford, Wine Cellar on Chalet, Basement on Oregon and Clubhouse, etc.
To an extent the same is true for ash, as in casual games, defenders are pretty relaxed with their reinforcements, often missing important walls etc, but in ranked, against good teams, that isn't true, the only thing she will have the opportunity to use it are random wooden barricades, castles reinforcements and shields. But gunfire can open wooden barricades, grenades take out shields, and to a degree, castles barricades. Her weapons are average and her armour is poor, so overall I wouldn't say she's on the same level as thatcher or thermite, which have pretty much essential abilities, and some of the best weapons in the game. She is very useful though, but not on the same level as Thatcher / Thermite.