Your point is a good one and is probably shared with mostly newish or new to modeling level of players. I can see where it would make sense, buy this and it will sound like this! However, in reality as many have said (in billions of posts) that is not possible. The most Line6 can do it try to make the defaults for the amps, effects, etc. sound the best it can through a range of monitoring systems (maybe the wrong words but I mean whatever is used to get sound from the Helix). IMO, they have gotten better at that.
For the new players that don't get immediately turned off, this can be a great learning opportunity that can improve their knowledge of what makes a good tone which I believe can help them be a better player. I don't know if it would be possible to "qualify" new customers' expectations on the possibilities of the expected sound without hurting the product sales. However, I believe that would help new players not get discouraged so fast.
I know in my case, I really have enjoyed the "tone" rabbit hole and have learned so much from sites like this.... and I have been playing line6 stuff since the first beans.....