You are overrating our players again.
You take one trait (solving problems) and you expand them to all other skills.
Again: Arthur is awesome in recycling possession and being press resistance.
He is quite shit in defending and in everything regarding creative play in the attacking third.
Now, look why:
Defensive contributions per match:
4,2 Modric 2013/14
4,1 Kroos 2016/17
4,0 Kroos 2014/15
3,7 Kroos 2015/16
3,7 Modric 2016/17
3,3 Modric 2014/15
3,0 Kroos 2017/18
3,0 Modric 2017/18
*******************
1,5 Arthur 2019/20
1,2 Arthur 2018/19
Key passes per match:
2,8 Kroos 2016/17
2,4 Kroos 2017/18
2,0 Kross 2014/15
1,9 Modric 2015/16
1,8 Kroos 2015/16
1,5 Modric 2017/18
1,5 Modric 2013/14
1,3 Modric 2016/17
1,2 Modric 2014/15
*****************
1,0 Arthur 2019/20
0,5 Arthur 2018/19
So, basically:
Kroos has around 3,5-4,0 defensive contribution per match in Real's years.
Modric is between 3,0 and 4,0 per match.
Our Arthur is at 1,5 currently.
In attack:
Kroos is at around 2,3 key passes per match in Real's years.
Modric is at around 1,5 key passes per match.
Arthur is at around 0,8.
So, basically, you are saying that Arthur could be as Modric-Kroos duo, even though he is equal as them ONLY in ONE AREA: press resistance and keeping possession.
While he is almost twice as worse in defensive and creative part.
I hope that you understand now why I think that you guys are insanely overrating Arthur's skills.
You are translating his one good skill into all other skills.
About learning and improving in the future: he already has bad professionalism, parties a lot, he could lose some weight, stamina problems, Std problems.
I am not too sure who safe is a bet that he will improve as expected in all of these areas from above with a current attitude and professionalism.