YES!!!!!
 
I can vouch for THAT, cartridges are  a 
horrible solution, LOW on taste 
and VERY costly .....
 
Of course I dont know anything about the "new" modern-day cartridges that may be coming out soon -perhaps they've made  HUGE progress and the NEW cartridges are wonderful...?
 
...BUT ACTUALLY...I kinda doubt it 
 
What I DO know is that when I started vaping in early 2011 I started on the Janty DURA, a 510 slimstick-cigalike-type, and it worked with flavoured cartridges...
 
Basically, the cartridges work like (Chewing) GUM  :  taste is great for the first TEN MINUTES, then it fades away big time.... :-(
 
And If you want  to taste something again gotta take   a new piece of gum...or ,in this case, a new cartridge ;-)  !!!!
 
Needless to say this quickly gets VERY  very expensive....
 
I ended up buying eliquid and refilling my cartridges myself,then moved on to bigger & better things (namely an Ego with LR cartos etc etc progress came very quickly in those days, something new came out practically every month!).
 
BUT Im sure it wont even be possible to do that with the "new" cartridges, probably cant be opened at all....not that you'd even WANT to go back to THAT old system nowadays anyway 
 
Of course I dont know for sure what the new BT " cartridges" are/will be like, but I suspect they'll not be very different from those old ones, with the same problems .....
 
The disappearance of Eliquid and the generalization of BT cartridges in its place would be a total NIGHTMARE for all "serious" vapers, especially those who enjoy FLAVOR (if you dont care about that  and dont mind vape-ing "tasteless" the cartridges can probably last a while  but either way it will certainly made the cost go WAY up ... 

 )