But then you are also assuming that everyone likes everything to work perfectly straight out of the box, without realising that there are some of us that like to get something to adapt and manipulate, "tinker" if you may, because some of us have just as much fun in the workshop as in the air, and that is something a lot of people with RTFs nowadays can't seem to comprehend, like making a balsa build and using white wood glue to build it. I am someone that enjoys it, and in the example of the 9X, I would get it specifically to mod, to personalize, like with the backlit screen, the FTDI module and things like that. It's like those that buy an arduino development board to learn to program, and those that want to buy something that is task specific, eventhough it may be arduino based. Part of the fun is the build itself.
The Devo 7E is exactly like that, as a developers transmitter... and if you look at the list of protocols it can handle it's very good, especially considering the final price. There are I understand a few places that even sell the readily modded 7E's for a small fee more. And yes, the signal can disrupt WiFi signals when turned onto maximum as it even disrupts my own WiFi at home... solution, don't use maximum setting if you don't need maximum setting. Also, a first time radio owner doesn't usually worry about things like telemetry or stuff like that until they have learned to master at least LOS flight... it is a pretty well known fact that this hobby seldom involves buying one transmitter for life. If on the other hand you are into technical things like setting up FPV, programming control boards, and running telemetry sensors, then really a small, easy mod is a cakewalk and you just have to remember basic things like if there is an RF shield, it must be there for a reason.
If the reason for not getting into the electronic or building side of things is because of lack of experience, well, nobody was born knowing and everyone started trying somewhere. Now, I've seen some very lame excuses on this side of the pond for example as to why people don't balsa build anymore, the biggest reason being "I don't have time for that"... yet they have time to be every football match glued to the TV for 90 minutes. Considering that football is a game where not much happens most of the time, to the extent of being probably the only sport that can end 0-0, I don't see how whose people can't glue a couple of pieces of wood together WHILST they are watching nothing going on!! Me personally, I usually do my building and tinkering with at least a movie/series running and reading through forums and facebook at the same time... now I know I'm a weird subspecies, but it' not that hard.
The range mod is not as hard as it seems, believe me. And also, don't base range on mW, because if you did that, you would never even consider Multiplex radios to be any good... the reason they were one of the last ones to bring out a 2.4ghz was bcause there is a huge power restriction on 2.4ghz systems in Europe, and they didn't want to release a system until it fully complied with the norms and still had a good range... those M-Link systems have a range of a mile and a bit, yet the are, on the books, the only ones really fully legal in Europe, as all the other brands actually transmit too much power for the norms to achieve the same range. Also, just as is with car horsepower rating, the specified power on paper isn't usually the specific power, but rather a "minimum" power... as many have tried out their 7E's and gotten a lot more, even double those 7mW that are advertised. I personally did the range mod because I can, not because I need...