I think this was often the advice widely quoted in the beginning. Partly because the safety trials put people onto the higher doses to see if they could tolerate them, and partly due to misunderstanding about what initial loading doses meant. MJ has a half-life of around 5 days in most people and so it takes time to build up to a level where it works effectively, but once people reach that level, there is no requirement to race up through the doses and a higher dose doesn’t mean more effective.
People need to find a level that meets their suppression needs without too many side effects. Within the extremes of nausea and not eating vs no side effects but no dietary changes there is personal choice too. Some people will choose a lower level of suppression so that they are still exercising willpower and control, others may choose to tolerate a higher level of side effects.
For most people who are losing weight on their current dose and tolerating the side effects, there is no need to increase the dose and If the side effects are too much, the advice is to reduce the dose. OTOH if there is no side effects and limited suppression, it is probably worth trying a higher dose.
We know that long term success comes from long term changes and I think (and I say this hypocritically as someone who is panicking if their next pen will turn up) that holding our nerves if we can, is the best plan. Steady progress is what we should be aiming for and we need to trust the process.