The ROCA skimped on the spare parts (just like the F-16V purchase) and where are the support vehicles and repair equipment for the M1s?
Modern comm systems cost a lot (look at the build outs for 5G (or even 4G LTE, it would run in the high ten/low eleven digits in USD for a mid sized nation). Now, a military system won't be as expensive, but military comms are a lot more expensive on a unit by unit basis.
The current 8X8 IFVs already had enough teething problems. Tracked IFVs will only be more expensive.
Manpower is a huge problem. Currently, the ROC Armed Forces have about .8% of the entire population. That would be a population burden equivalent to 2.4 million (USA) or 10 million (Mainland).
It is also included in the package, news outlets typically do not go into the fine detail of every single bolt and nut. In earlier articles they have listed the deal as including heavy transport vehicles and recovery vehicles and this is already on top of their existing fleet of support vehicles which can just as easily be tuned to service the m1 instead so there is really no issue here. And I have yet to see any report of taiwan actively cutting corners on the f-16 either. As of now their fleet is perfectly serviceable.
And again, while what you say about military equipments are more expensive than its civilian counterparts is true, it again comes down to where Taipei can get a good price for its budget, and all indications shows that they most likely are.
And judging by the numbers and different variants built by Taiwan, if the CM-32 had any teething problems to begin with , that issue had long since pass. Not that teething issues play a significant part in budgeting issued to begin with, as said before it all comes down to what the final price tag will be. The same will apply for any potential tracked IFV in the future
And how large a army is vis a vis it's population does not automatically translate into a burden. During the Cold War the US has nearly 2.1 million active duty troops which is close to the ratio in Taiwan today (US population was 250 million in 1990), yet they can afford to keep that level far for almost an indefinite period. It all boils down to how productive the rest of the country and population is to support the armed forces and we have seen no evidence to the contrary in Taiwan