If you think this, then I have no idea why you think this is different than the Cubs shifting around Addison Russell or Kris Bryant in their first couple of seasons. Russell had played a total of 5 career minor league games at 2B when he was called up as a 2B. Bryce had always played C and had fewer than 300 innings of CF in the minors and then played 92 games in CF as a 19-year old rookie.
Would it be nice if the Nationals found a good permanent home for Trea Turner? Of course. But it seems like an overreaction to think that this temporary move will hurt him somehow. I'm sure if you gave Trea Turner a choice of getting called up to the majors in CF or staying in the minors at SS, he'd choose the former.
I'm having a hard time figuring out why you're having trouble understanding my stance.
I've addressed, multiple times in this thread, the things you just mentioned.
Regarding an Addison Russell comparison: I've stated multiple times that I believe Trea should be up and playing 2nd base, woth Murphy at first. Clearly, that says I'm ok with him playing 2b.
Regarding a Kris Bryant comparison: I have stated that I do not believe there is one. Playing 3b and LF is not comparable to.playing SS and CF. Bryant is playing positions more regarded for their bat, and Trea is playing two spots where defense is very important.
The correct Cub youngster comparison would be Baez. He's played numerous spots, including short and the outfield. But, I've also said a utility role for Trea is something that I'm fine with for the year.
What I do not believe is very wise is moving Trea to CF full time. Especially asking him to play CF for a year and a hakf, maybe more, and then expecting him to shift back to SS. It is a totally different world fielding grounders, reading ground balls, bacl handing balls in the hole, charging and picking it and tjrowing off balance to first than it is to judge the direction and depth of fly balls and tjrowing with a full load or wind up. Trea is still a work in progress at short. To completely shut down playing short for a long time absolutely does not help him improve defensively. I do not think he will forget how to play short, but it definitely halts improvement and I believe it does harm the natural instincts and reactions by stepping away for such a long time.
I am fine with Trea playing CF for the rest of the year, but believe he should return to SS next year. I'm fine with Trea playing a utility role. At least in a utility role, you are not completely shutting down your defensive responsibility and work as an infielder. It's a short period of time and he would still he able to sharpen his skills by playing his natural spot (infield, whether 2b or ss) at times.
I just dis agree with the notion that he should play CF full time for 18 months, with an eye towards moving him back to Ss. I also disagree with the idea that that's an easy move to make. I also believe his value is much greater as a SS, which is why I believe he should stay there long term.
To re-iterate. I'm fine wth Trea playing CF the rest of this year. I'm fine with Trea playing a utility role this year. I just disagree with him playing CF full time, beyond this year. Whether full time or with the thought he can easily transition back in 2 years. If I had a say, he's up playing 2b with Murphy playing 1st and CF isn't even a discussion.