Absolutely agreed.
Considering Hong Kong is a city that is part of the country of China and that they are indeed heavily economically and socially intertwined of course the authorities in both places should be co-ordinating on solving problems, more so the national and regional governments assisting/augmenting/guiding the city government on city problems that are caused and/or exacerbated by regional and/or national factors such as housing affordability and availability/pricing of necessities such as healthcare, baby formula, etc. These are problems that objectively involve factors due to Hong Kong's relationship with China (including disparities) and Chinese consumers'/investors'/immigrants' activities in Hong Kong, this is not "blaming mainlanders" nor are Hong Kongers necessarily "beneficiaries". Again at the end of the day I say the responsibility for this perfect storm primarily lies with the failure over time of the Hong Kong authorities and elites to take care of their people, manage their city, and lead their society, at this point besides from Hong Kongers themselves the only other entities capable of helping the situation are the rest of China.
All along there are only two valid grievances to be addressed (at this point one has actually been met) and three invalid grievances to be dropped in terms of the five official grievances from the rioters, protesters, and their supporters. Then there is the most important and urgent grievance that so far has been insufficiently addressed by the Hong Kong authorities, this grievance is from the rest (majority) of Hong Kong society against the property destruction, assaults on people, disinformation campaign, obstruction of justice and normal life by the rioters, protesters, and their supporters.