Yeah Dbz used to be super consistent. Especially the cell saga, which was all about reaching your limits. There were variations to the SSJ forms and it was clear they couldn't go much more beyond that. Goku himself stopped training because it was meaningless.
7 years later Vegeta MIGHT have reached Gohan's previous strenght, and Goku was his equal, making it abundantly clear he only got a new transformation due to being dead. That was good writing, there were limits and characters had to resort to gimmicks to go beyond like fusions and short bursts of power with ssj3.
Hxh I find it good because the physical limits aren't that high. The ceiling was established with Hanzo, Hisoka and Illumi in the very first arc so any martial arts master with Nen can be competent in this manga and the protagonists aren't endlessly growing.
Besides DBS breaking all limits, Naruto and Bleach also fucked everything up. Naruto worked best when there were clear upper limits. On the first arc we get to see Kakashi, a genius Jounin, fighting and barely beating a legendary S Class criminal. Then a Kage (the rank the MC wants) fights a legendary Sannin (akatsuki level) along 2 zombie Kages setting the power levels for the rest of the manga... But Kishi breaks everything and by shippuden Naruto himself can fodderize Kages and akatsukis alike.
The endless growth thing ruins the scale of any manga.