I humbly disagree with this opinion. So many famous isekais shows their main ability beginning of series like Rimuru’s great sage, and Ainz ooal gown’s crazy magic, etc. what’s the problem with it? It still does fine. And first person is also another thing a lot of isekai novels are written like
Fantasy · HouseOfLee
Pornographic Content Hate or bullying Release of personal info Violence Spam Other
Webnovel 
I humbly disagree with this opinion. So many famous isekais shows their main ability beginning of series like Rimuru’s great sage, and Ainz ooal gown’s crazy magic, etc. what’s the problem with it? It still does fine. And first person is also another thing a lot of isekai novels are written like
My Copy System is So Overpowered, That No One Can Beat Me!
Fantasy · HouseOfLee