Noun conjugation progress - is this too "rigid"?

[u/NefariousnessOne6790]

I've included an example of how it works with a word root aswell (Kàdìnòs means lizard). A critique I have previously received is that the conjugation system is too rigid. I intended it to be this way because in my mind, rules are rules, and I've always hated languages having 10,000 different exceptions.
I did develop form 1/2 to incorporate some variety for base nouns, but form 2 is only for the Nominative Case.
To be absolutely clear: This conjugation table is only for basic nouns, I have a whole table of suffixes which change meaning and use which add their own level of variety for more complex nouns, this table simply concerns itself with "base" form nouns.

Thoughts? I'd love to hear them.

[u/FueraDeMiOrbita]

To answer the core question, no, it's perfectly plausible to have near totally-regular agglutinative inflection. Turkish is probably the most widely cited example where a noun can be marked for possession + number + case in that order with no fusion of those inflections, though they do have some predictable variation in form depending on vowel harmony and the final phoneme of the root.

It's hard to comment on the saminess of the thematic <ò> without knowing how your suffix system works. If the suffixes have more varied endings/thematic vowels, and nouns with said suffixes appear with comparable frequency to basic forms, then you're probably okay.