I wouldn't say so. In the way that if you stop using for a year or two the euphoria comes back. There is of course, a regular tolerance that develops like with all things. Me personally, I never got much euphoria from heroin even at the beginning. But with fentanyl or hydromorphone, the euphoria does return after a break, even if Suboxone or kratom were used as maintenance inbetween.
However for meth or MDMA there really does seem to be a tolerance that to some degree never goes away, no matter how long you stop using.
But you know, euphoria isn't an exact science and everyone is different so ymmv.
Also It is true, as someone above said that tolerance and dependence are one and the same...