Yoshi-P: "If you want more engaging content, go play Ultimate"

[Thorio]

1st: Being lv90 is the bare minimun to experience the endgame and its not even a big time invest, if reaching it is an indicator of "you should leave the game" then the game has a HUGE problem with its content.

2nd: Running away won't magically solve the healing problems that are present from sastasha to the latest savage tier, that "you can leave" excuse may work for the content droughts as content gets delivered over time but it doesn't and never will work when we talk about gameplay design issues

I have close to 450 hours and still lvl 65. I'm not sure in what world getting to 90 isn't a big time investment but okay.
Healers in specifically might be a problem, I admit I have little experience as one as I pretty much just have a lvl 51 astro but it's just the philosophy of the dev team and in general really. You can't expect to play 8 to 10 hours a day and never run out of content, it's unrealistic.