Absolutely smallest and cheapest won't have core-coupled RAMs, of course.
If you meant the "Tightly Coupled Memory" (TCM) feature provided by ARM, that's an OPTION in CM7, not available at all in CM0 through CM4.
I don't know what any table says, and I'm not always exactly correct. But, I have been happily using fast core-coupled RAMs for timing critical and deterministic interrupt stuff in MCUs with CM3 and CM4 cores, and being non-existing or imaginary, I have measured them working remarkably well!
STM32F334 being one such example I can remember*. Clearly, it's ST's addition, and not the "ARM's option". The name is "CCM" for core-coupled memory instead of "TCM". This terminology is similarly irrelevant as is the classical discussion on "who's fault the bug is". I buy real MCU's based on what they offer and how they perform. An actual $3 ARM MCU offering me way better performance than a $3 8-bitter (including real-world interrupt latency, measured on real-world terms; I use oscillosscope to measure from trigger to result) and way better peripherals offloading the CPU even further, is the fact of reality, and as I have stated earlier, it has quite little to do with
ARM exactly. IMHO, ARM core is boring enough not to be fanboy'ed over.
*) I did something similar on STM32F205 on its another extra SRAM, but it shares the bus and hence, heavy DMA traffic can cause a few clock cycles of jitter on interrupt latency during stack push, which is guaranteed 50% of bus arbitration cycles. Whether this is important, when the actual interrupt processing latency at 120MHz is still likely to be faster than on almost any 8-bitter, is up to you decide.
But yeah, I have also put a single quickly-needed instruction on the AVR's interrupt table directly, avoiding the delay of the jump. At 20MHz, this is very fast as well, and indeed will outperform a cheap M0 stacking registers through a bus also used by DMA. But most of the time, the timing-critical interrupts are longer than that, and the important result happens later than at the first machine instruction.
I mostly use the very cheapest 8-bitters only, but I guess most share this viewpoint nowadays; the "large $5 AVRs" make even less sense today than they made a decade ago.