That is a rather strange example, but I think I get it. However I’m not in the business of getting folks to their potential. I’m not dating my gamers and I don’t work with them. This is my leisure time and I’m going to optimize it which means I get to be picky.
This is also your player's leisure time. If you get to be picky because it is your leisure time, why can't they choose to play the PCs that make them happy?
I’d look at it more like baseball softball. The majors are folks that make a living at it. State of the art equipment and competition at the highest level. Fast pitch softball is often competitive and folks are dedicated without it being their main focus. Then you have slow pitch casual games that anybody can join and isn’t really about the competition.
Some folks think you can mix and match, but all my experiences lead me to believe you are better off meeting the group where they are at then adjust to the variety. Clearly, my miles vary.
Truly, your miles seem different to you, but the question I'd ask you to consider is
why the groups can't match?
Picture 9 people playing ball. The first is a former MLB catcher. The second was a college pitcher. The third a high school star that didn't go to college. Then there are a few folks that played in high school, a bench warmer and someone's significant other that has never held a bat before, but thinks this could be fun.
In one scenario, the former MLB person is frustrated that everybody sucks, that nobody is taking it as seriously as him, and that nobody is really making a win the priority. The former college player agrees, but doesn't realize the MLB player considers him in that bucket of people that suck. There is bickering and criticism, and pretty soon nobody has fun and everyone is looking to end early.
In the next scenario, everyone is having fun. The former MLB player is showboating - with one at bat sending the ball out of sight, and the next a strikeout as he tries to hit the ball with the bat between his legs. The college player tried to blast one out after the MLB player, but had to give mad respect at the imporessive shot - but did manage to make contact with the bat between his legs (non-dirty). The other folks are playing and everyone cheers on the significant other when they manage to make contact that goes nearly as far as the one hit between the legs of the college players. There may have been drinking. Who is to say.
The situation is going to be what we make of it. Every time people get together to have fun, the people that are there are deciding whether it will be fun or failure.
Speaking from experience: You absolutely can have powergamers at the table with inexperienced or RP focused players while
everyone has fun. It isn't a lot of work, either. It just takes the right mentality. This game is only as fragile as we make it. One of the groups I currently DM has two optimized builds and two really odd builds that are on the weaker side. Everyone is having fun. The optimized builds are doing 80% of the damage. However, the other two have starring roles in some of the storylines. Everyone is itching to get back to the table to discover what comes next.
You can say, "That is fine - but that is not how I want to play." To an extent, that is fine - but my question would be whether you're making the players happy with your approach, or if they have any frustrations or disappointments in having options curtailed when there are steps to avoid powergaming.