I have been thinking more about Alix repeatedly urging Nicholas to 'be strong' & 'show them a strong hand' etc. etc. This has sometimes been described as a negative aspect of her, but in fact, considering the way in which some members of the family took advantage of his gentle nature, it may well be a positive attribute. Perhaps Alix could see that since Nicholas lacked his father's 'presence', certain members of the family - including his uncles - were likely to show him insufficient respect, and to dismiss his ideas.
Nicholas was in a very difficult situation because his uncles were all such strong characters &, combined with this, he had doubtlessly been raised to show deference to his elders. I cannot imagine how it must have felt to suddenly (at quite an early age) have to reprimand and stand up to one's own relations of an older generation.
Alix's prompting & urging may have shown greater insight than we have given her credit for. From the beginning of the reign, these older people - who should have supported him - were using him & playing him off against one another (e.g. the rivalry between Serge & Vladimir; the way Miechen used the Royal Box without permission, the way Pavel broke his allegiance and married...) When Nicholas did stand up to these people, the family divided against him. Vladimir, rather than accepting the reprimand of Miechen, wrote a very indignant letter to Nicholas. The dispute about whether or not to attend the Montebello Ball divided the family still further. No wonder Alix needed to urge Nicholas to, "Be strong!" I do not think this implied that he was weak, but rather as Alix said often, 'You are too kind...' meaning that the less scrupulous members of the family were taking advantage of his kindness.