You cannot have a one size fits all VLS tube.
That was the plan... they developed Onyx/Yakhont/Brahmos, and the Kalibr (Club) range and of course the anti sub 91ER1/2 missiles to fit the UKSK design.
They designed Redut for the S-300, S-350, S-400, and the 9M100 missiles.
The UKSK-M seems to allow bigger S-500 and therefore also the smaller S-400/350/300 and 9M100 missiles too, plus as most of the Kalibr and Club missiles were designed to be fired from torpedo tubes and are therefore 533mm calibre weapons, while the Onyx family are something like 750mm even in the old UKSK launcher there is enormous amounts of space to increase size and expand performance, but with the UKSK-M they will likely have even bigger tubes.
For the bigger vessels like destroyers and up then the bigger UKSK-M make sense, while smaller vessels can use the UKSK which is big enough for the missiles they will likely carry.
The US couldn't have a one size fits all VLS tube because they designed their missiles and then developed their tubes, so the ESSM.. essentially Sparrow AAMs, and Harpoon and Standard SAMs and Tomahawk cruise missiles and of course ASROC missiles are all widely different sizes and shapes which means they have different sized vertical launch tubes on different ships.
The Soviets would be in a much worse situation of course... Vulcan, and Granit and Grannat and Sunburn and all the other anti ship missiles they had in service alone would have been a nightmare to fit into a VLS system... so they started from scratch effectively.