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The frustrating thing is that China waited until it got hit hard by a Covid wave to decide that now is the time to relax a lot of its travel restrictions ... which is hard to read as anything but a move to placate domestic unrest, which has begun to simmer recently, at the expense of the health of many people worldwide.
They could have relaxed their zero covid policies domestically and wait until the wave got reasonably contained while ramping up vaccinations before opening up travel but ... here we are, and it's hard to see it as anything but a cynical play for the domestic audience.  And then of course, now that countries are asking inbound travelers for Covid tests, they get to play the discrimination card and gin up more public support.
Meanwhile, in Canada... >

It started in China with those deadly scenes from overcrowded hospitals.
It's mind boggling how utterly unprepared Cina is and COVID is hitting back at them exactly 3 years later.
Guess the Coronavirus refused to stick to the government plans. >

? 
havent been paying attention to china news lately?
China was undergoing unprecidented nationwide protests over its "zero covid" policy. some of the largest protests it has seen in recent memory. Eventually the government relaxed the policy finally about a month or two ago. 
Because Xi and the chinese government highly politicized and propagandized against western vaccines early on when Sinovax came around. most Chinese citizens absolutely refuse to trust western vaccines. this is ontop of a natural reluctance to get vaccinated especially by those living in the countryside, and the elderly.
It turns out Sinovax is FAR less effective than whats found in the west. as such many chinese citizens lack immunity and are especially vulnerable to all the newer strains that developed since the beggining of the pandemic...
this has created this "perfect storm" that china now finds itself in. with 37 million new cases being diagnosed per day. China lacks the medical facilities to deal with this level of infection as well. so were quite possibly seeing the beggining of another humongous health crisis.
edits: grammer and some extra sentances. >

the people protested the lockdowns, and the government stupidly lifted the lockdowns. The people also protested the various vaccine mandates when they were attempted, so the government made it voluntary, even for the ones that really should be taking it. So, I doubt the vaccination rates would go up even if it's a western one. >

The same lockdowns Reddit was lambasting China for just a couple weeks ago. >

How many more years of lockdowns do you need? >

I don't think that's their point. When Redditors saw the protests, they proclaimed how great the people protesting were and that it'd be another Tianenman. Instead, the government lifted lockdowns as the protestors wished, and now those same people are criticizing the action taken. The overwhelming viewpoint on mainstream subreddits is that China is bad, no matter what, and whatever policy they choose will be mindlessly criticized. 
Calling China a danger to the world for accepting we have to live with Covid, as the western world has done for almost 2 years now, is plainly nonsense, but nobody seems to actually think about what they're upvoting. >

Phased unlocking was a necessity to prevent the collapse of medical systems. Given the rate of serious outcomes given the efficacy of China's vaccine (and vaccination rates), and the lowered rate of serious outcomes from Omicron, they should experience a rate of hospitalisation 85-95% lower than a country opening up during delta without vaccination. 
Time will tell if their system can stand up to it, but opening up now is a very different situation compared to opening up 2 years ago, and I'm sure smarter people than you and I have done the math.