I disagree, as effectively there is little to no difference to refereeing at level 6 and level 5. Where I do agree though is those that go 7 to 4, or even 6 to 4 in the same season, as there you are going from grass roots football to the semi-pro game with paid players and paying spectators. I did the latter and I'm big enough to say I was a bit of a mess in the my first few games at level 4, I was OK longer term because I'm quite confident and thick skinned and therefore recovered. Not everyone will be able to do that though.
With 7 to 5 they are still going through two promotion seasons, they are just condensed into one. Where I think 7 to 5 is useful is for referees that have spent a while at L7 and for whatever reason couldn't go for promotion earlier. Would I recommend it for someone who has only recently qualified? No, I wouldn't, unless I had seen them refereeing and thought that they were ready for it. I certainly don't think it should be banned though as I have seen many referees go through that route and make it to L3 and beyond.
CFAs can also help by putting conditions around it, for example anyone going 7 to 5, or even all promotion candidates, must act as assistant referee on a supply league. When I came through there was a requirement for x number of lines to get to L4, but not at what level, consequently I found myself on the line for a step 4 game when I hadn't done any lines at steps 5, 6 or even 7. I was OK decisions wise, but I didn't know the basics like holding the offside flag until the ball is correctly placed, or returning from checking the nets together.