Why on earth consider an alternative just to suit you?
When I was using a Brompton for a particular journey, I could arrive at my London terminus, and be at my ultimate destination within approximately 12 minutes. To do the same by Underground would take just as long, plus still require a walk of approximately 10 minutes on the end of it. This alternative was also less reliable as sometimes the first Underground train may be too busy to board, and normally at least one day of the week there would be some kind of disruption. The upshot of this would mean I'd have to be on a train leaving home 30 minutes earlier. With the same applying in the afternoon, this is 5 hours extra travel time per week.
Since you are so badly failing to see why folding the bike when entering the station is a needless inconvenience which causes more problems than it solves, one can only assume you've never used a folding bike, therefore are speaking from a position of ignorance. Evidently the TOCs are more informed on the matter, as it seems the relevant rules are that bikes are to be folded *on trains*.
It seems very much to me that you do not consider how often people with bikes inconvenience other passengers. We are not taking about a once in a blue moon event here, I see it many times each week, inconsiderate bike owners paying no heed to basic politeness and common sense, often getting in people's way, causing delay and disruption, ignoring designated areas for bike storage, and even sometimes using their bike as a battering ram to secure themselves a spot on the platform or train. So if a member of station staff, or indeed a TOC takes it upon themselves to enforce additional codes of conduct that may slightly inconvenience the bike owners then that is fair enough. You cannot possibly be unaware just how much bad behaviour there is from your fellow cyclists, especially in London.
I am not saying that bikes should not be carried, but that cyclists should pay extra attention to the people aroumd them because there are few larger objects routinely carried on trains. So it is not too much to expect cyclists to be a bit more respectful of their surrounding fellow commuters instead of throwing hissy fits about having to carry their bikes. You choose to use it, you are not forced to. However the people around you have no choice when they are having to scramble over abandoned bikes, folded or unfolded left in doorwells of busy trains.
For the record I used to cycle hundreds of miles a week, I always obeyed the Highway Code, never tried to take my bike onto a crowded train unless there was a suitable place to safely store it, and made damn sure I paid attention to my surroundings to ensure nobody was inconvenienced by my bike. I have never used a folding bike, especially one that is such a fashion item, but that is irrelevant. I often travel with one or even two suitcases often weighing far in excess of a bike when travelling on holiday. And I still manage not to get in other people's way.