Positive approaches, advice, perspectives are always useful.
Your encouragement is valuable & will help some, though I have no belief in 'hope', only action.
I respect your perspective and agree with it to a point and for some.
However, it also ('for me' - I don't say it is intended) has a hint of what is one of the worst, if not *the* worst words that the truly depressed can hear - "Just move on".
Depression is as the blackest of nightmares - it arrives unexpectedly, suddenly & with only the most minute glimpses of light that may allow escape.
Rational thought is predominantly negated as is the ability - scarce in even well people - to be objective about one's situation and experience.
Depression takes over and depletes its victim's reserves, yet the victim's life context almost invariably unchanged and fraught with many of the very experiences, exchanges, threats (percieved or real), fears, misunderstandings or other factors that have caused the mind to respond as it does.
Yes, for want of appropriate qualitative words to describe them, there are differing degrees of depression and awareness of its often very subtle initial and gently progressive subjugation of one's ability to stay well.
Some will recognise its onset and may have the awareness, strength, will and equanimity to gather themselves and take action such as you suggest, whilst others will be appeasers and so strengthen its hold.
Hoever, for most, in my view it will have occupied the territory of the mind before realisation of what's happened and that it wasn't a friend offering release but an enemy engaged in entrapment.
So, what am I trying to say in such a long-winded way? That depression has to be anticipated if there is to be a real chance of combating it. That anticipation has to come as much, if not more from those without than the victim themselves. It needs to come from family, friends, peer group, colleagues, community and wider society. It needs to come from humanity.
Unfortunately, onus for depression is largely placed on its victim. Some even deny its reality and view it as a peculiar form of malinguering. Most are made uncomfortable by its nearness and so avoid those who exhibit its symptoms.
Help, whilst sincerely meant, most often is based on social and cultural norms that miss the reality of the disease or the holistic contributing dynamics. Not least is the view that suicide is bad or wrong - a hypocrisy evidenced by humanity's blithe acceptance of tens of thousands of deaths each day from poverty, crime, dispossession, legalised murder, authoritarianism, dictatorship and war.
The reality is that depression is a perfectly valid & understandable reaction to the insanity that humanity visits upon its world, just as a desire to leave it is readily understandable.
If we truly want to eliminate this disease then we need to collobarage with understandng and caring, regardless of difference in whatever regard and work together as a World community to create a planet where all have at least the chance to live with adequate well-being and free from fear, whether that be of a localised or more remote threat.