I guess those problems exist with any razor. I literally couldn't get blades on and off my 6S with the first top cap I received, because the posts were too wide for the blades to fit. The second top cap was fine.
The main thing is that Rockwell's support is top-notch, so if you have an issue, they'll send out a new part without a fuss.
Some blades are harder to get on and off my 6S than others, you think I’d make a better not of which ones but I do remember being a little nervous about how precarious it was getting a Personna blade out of there.
But I’m not going to complain about an unmovable blade on a symmetrical top cap. This was a replacement for my first 6S because that top cap was making the blade exposure uneven and they did replace it free of charge - eventually. It took about 2 weeks to hear back from them from contacting them... but it was summer vacation. So I do agree it’s a matter of a new company growing. And this was after the first 6S I had ordered was lost in the mail and never delivered... soooo I had a long wait before I was happy with my 6S. But happy with it I am. Mostly.