I have simple position.
Reactors take upwards of 30 years to be commissioned in the western world. These are timelines are so long that it's impossible to build in the capacity supply from the reactor into Energy capacity planning.
A 30 year commissioning period is a massive commitment in capital $$ with absolutely no return. In fact this is typically funded by debt which literally multiples the debt by 10x or more. This is irresponsible to even consider any more.
SMR is a new tech. All of the controls and safety aspects of the mega reactors must still all be present in smaller reactors. This has to be exhaustively tested and evaluate before general acceptance and willingness to adopt the technology can occur. This could add decades more to the delivery puzzle.
Nuclear reactors of any kind need water. LOTS of fresh water. With water becoming increasingly a critical resource it makes the potential regions of deployment of a SMR dwindle dramatically.
Nuclear reactors like to be built where people like to live. A nuclear reactor effectively needs to be built on high value land that is high sought after for housing. Now once a reactor is built in a location that land can effectively never be used again for any purpose. It becomes inaccessible wild land at best.
Nuclear reactors need land that is effectively free of risk of natural disasters. As we have seen in recent years land that was once considered safe has experience significant impact from nature. Fire, flood, storms, etc are all intensifying. Japan proves that this is something we can no longer overlook.
No one wants nuclear waste. In Australia it has gotten so bad that there are industrial areas in the middle of nowhere where nuclear waste is being stored in rusting steal drums out in the open exposed to the elements. Increasingly the transport of nuclear material through areas is being outlawed. How can the restriction of movement and storage of nuclear material support the deployment of several SMR's? Just how many ports will even allow nuclear material to move via them?
Nuclear Power is a waste of effort. Just why even bother. If the money needed to be sunk into the development of an SMR went instead to storage technology we would be far further ahead in a far sooner timeframe. Renewables have already demonstrated that they can scale up and down to meet the needs. With almost zero additional investment and development. Renewables generate $$ far sooner than traditional power systems. Renewables can be decommissioned and the land returned with almost zero land remediation needing to be done. You can build a solar plant and in 15 years move it when someone decides that land is better used for something else. Can't do that with nuclear.
( My grammar is garbage I know that. no need to point it out. )