My previous Zoe (22kWh) had minor issues with water, but I wouldn't put an exclamation mark. In very heavy rain, where you wouldn't be able to drive the car anyway because of reduced visibility, you are likely to have a few droplets of water forming on the interior seal, at driver head level. As far as my 4 year experience with the previous generation, this only happened maybe a few (3-4) times, but no droplet reached the seats or the interior door armrest.
With the new ZE50 I didn't encounter yet any water creeping in anywhere, nor did I pay that much attention to it...
If after a rain you have water on the armrest and/or the seat, that is indeed a huge issue and Renault should fix it.