Sony seems to be using the lower pricing of the 3rd party accessories to build a more robust ecosystem to where they can charge more for their bodies. Canon seem to be charging less for their bodies to sell more accesories. Take the R6miii which Canon has priced at $2,800. Sony releases the direct competior A7V AFTER Canon with LESS features and prices it at $2,900.
Canon releases the R5mii at $4,400 and then put in on sale for $3,900. Meanwhile Sony releases the A1II AFTER the R5mii, doesn't update much, adds precapture and increases the price to $7k.
Sony spent years trying to put out camera bodies with more tech that are priced aggressively to make up for their lack of historical customer base. Its clear they now feel they have enough people tied to their ecosystem that they no longer need to compete on price and specs. So now Canon is saying hey we have the better specs per price buy our camera and then when they need a new lens they makeup the extra money. Sony is saying pay more upfront for our bodies because you'll have cheaper options for accessories that we wont make money from later.
Sony seems to be focused on being a premium product. The Chinese may be able to attack the budget and eventually the midrange but they will probably always have trouble branding luxury products. This seems to be the same lesson they've learned in the TV space. Companies like TCL and Hisense make the best TV's for the money and have gobbled up market share. Sony focuses on the high end luxury tvs and makes more per unit due to that image.
While Canon is primarily an imaging and printing company Sony is an electronics company. If smartphones were to replace cameras then Sony would just either make smarthones or sell the sensors to the companies who are. If the Chinese start making apsc or full frame cameras, they'll just sell them the sensors. They sell more sensors to car makers then they put in cameras.
Camera are about 5% of Sony's revnue so if they completely lost that entire market to the Chinese and picked up some sensor sales that wouldn't be that impactful. Meanwhile Cameras are 20% of Canon's revenue and they aren't a major seller of sensors. As a result Canon seems to be more invested in Cameras as an actualy product that is key to their business where as Sony seems to treat cameras as a means to an end.