This mod was designed in 2014. Along the way, some asked me if it had an adjustable 510. I said no. It would add complexity and cost. The Mymod is designed to be as simple as possible, and the price reflects that. The current design works fine if one uses an O-ring. If one does not want an O-ring, the other deeper 510 can be tried. And if necessary, I can always design an new/adjustable 510 and the user can swap it themselves. Or even add a solid insulator. There are many ways to "resolve" this.
According to your description of the old REO, it was similar in that it used a silicone gasket that can "warp or break if you torqued the atty down too tight." Very few people trashed the REO back in 2014.
People wanted stainless steel everything (510, center pin), no brass, etc, That was the priority back then. They didn't make a huge deal on having adjustable 510s. I didn't know any adjustable 510s on the market that was pure s.s with no brass.
So I guess you can argue the Mymod is a bit outdated in design, and I do have another design in the works that will be very current. I will sell a few to friends nearby in the end of July (before the FDA deadline), and then give some to ECF members to try before I make a thread on it. Since I wouldn't be able to make much changes after 8/9, their trial would be purely for feedback. It's okay. All the lessons learned so far will be applied so the design will be solid before I send it to anyone. Those who bought the Mymod will be able to get a $100 credit toward the new design, which makes the Mymod essentially free. How's that for "beta testing."