Yeah, you would think. Theoretically, balance charging 2S Lipos is less critical than higher cell counts particularly for high quality low discharge rate batteries but it's not a "good" idea.
However the stock battery is NiMH and that is what the new charger they sell is for...
https://alofthobbies.com/nimh-charger-for-the-qx7s.html
I don't know if a new QX7S's comes with that but it may
Previously you had to unplug the battery to use the FCX07 charger so it could be a design change and a phase out of the FCX07. If you want to use a Lipo you are on your own...how it was with the X9D and how it should be imo.
After the really good decisions FrSky made with the orignal X9D battery and charger setup, they have made a number of missteps with that aspect of their TXs from non removeable to misusing USB B to using and unpopular size of LIon to making a charge port with exposed pins and no cover...so possibly they are still confused on this issue or have decided to return to the basics...just speculation on my part. If it is a return to basics that is a good thing imo. Trying to respond to customer demands for this aspect is a fools errand. Just enabling the TX to be powered from any resaonable battery by giving it a good voltage regulator and some reverse polarity protection and a large battery bay with an included NiMH battery and charger good for most people as was done on the X9D is a good solution and they should just have stuck with it.