There is a bit of elasticity / movement range in the front even in walk mode. The walk mode just adds tension to the system, it does not lock it out. Unless it is an issue (meaning super annoying, causes you to walk super funny and/or loose your ski (or confidence in the system)) I would not be overly concerned about it. If the play is caused by that "design feature" then it will probably not get worse over time.
Sure - traditional tech toes lock out all the way, but then again they have no meaningful elasticity in the front when going back down, nor do they release if you get caught in an avalance while in walk mode. I guess there is always a compromise
Unless ride feel/front elasticity and safety /frontal release is your main priority and you plan (for her) to ski these hard in variable conditions, I would not go Tecton for a dedicated touring setup due to weight. That is, you you want to add 300gr or so to the setup investing it in slightly stronger skis might give a bigger benefit than heavier bindings. If you will mostly see soft / good snow then a traditional tech binding such as a MTN will be a lot lighter making for happier touring while descending well. Or, they descend pretty damn well regardless of snow conditions within the confines of being a tech binding.
If you want the safer/stronger setup Vipecs could also be a solid, and slightly ligther option. Ion10s does not add anything to the setup that a 300-400gr tech binding does not other than extra weight, and a Kingpin is def not the way to go - just the more (or same for the new m werks) weight, but worse ride feel (no toe elasticity) and safety (no frontal release). Considering one can get Tectons and Shifts, the Kingpin design should be dead in the water imho (cue comments about plastic and AFD migration / pre-release respectively).
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