Cypress' best offerings are ARM CORTEX-M0 / M3 type devices some of which have some fairly noteworthy and perhaps somewhat unusual integrated peripherals such as CPLD-like digital blocks (UDBs), programmable function/configuration/interconnection analog signal processing blocks, a bluetooth low energy modem, fairly high resolution sigma delta ADCs, and so forth. Those are the PSOC 4 / 5 lines. They also inherited some other ARM MCUs from Spansion.
I don't think Cypress specializes in the 4-8 I/O pin MCU class anymore. They had some specialty analog/digital/sensor interface integrated 8-bit MCUs with the PSOC-1 line but those are pretty close to obsolete these days.
Actually I do recollect that a couple off their lowest end PSOC 4000 series Cortex-M0 MCUs are around $0.45 and have only a few pins, though I forget if that's 8 pins, 16, 24, or something in between. That's fairly comparable to a low to mid-range value line MSP430 IC, same or less peripherals, better processor wrt. 32 bit ARM C-M0 that's faster anyway.
Some of their bluetooth ICs and other ARM C-M0 ICs are in packages with under 24 I/O pins.
I think many times vendors do get stuck with what they have for various reasons. As someone who is not even at the level of novice, I recognize this in e.g. scopes. Legacy customers, laziness, inertia, etc. TI seems big enough and ancient enough that they may very well be in this boat with a lot of products.
But I looked at Cypress and the website was just too hard to navigate. Couldn't even find a family to family comparison chart. Still, with what I did find, it seemed they were heavily oriented to 32bit and devices with large number of I/O. Seemed to be consistent with "SoC" vs TI "MCU". Does Cypress have anything that is more on the order of only 4-8 I/O pins?