I’ve used it quite extensivly, big fan. It asks for further details on objects that have already been mapped, which also reveals things that don’t exist anymore. It turns mapping into a really fun game with currently 163 different quests. The app also regularly asks you to verify opening hours or confirm the existence of certain objects. That being said, I almost always use it in conjunction with a real map editor, to add new stuff I find or to make more complex edits.
There are other fast charging standards than Power Delivery. USB Battery Charging defines that when the data lines are shorted, a device can draw more current (up to 1.5A), but still at 5V. QuickCharge on the other hand uses the data lines to negotiate higher voltages, so an A-to-C cable can’t protect you from that.
For Power Delivery, higher voltages are negotiated using the CC (configuration channel) pins. If you use an A-to-C cable, the A side does not have the CC pins and therefore you can’t get more than 5V.
Have you checked what voltage arrives on the board if you use a regular USB-C charger? Maybe the headphones negotiate and need a higher voltage than 5V. Does it charge with only 5V supplied? (could be forced by using an A-to-C cable in case of Power Delivery)
I’ve never used InqScribe nor any other subtitle tool, but alternativeto.net has a list of alternatives like Kainote or SubtitleEdit: https://alternativeto.net/software/kainote/?license=opensource There’s even a short Wikipedia article: https://en.m.wikipedia.org/wiki/Comparison_of_subtitle_editors