The mod argument is easy, especially in a game that's vision isn't fully realized. Devs say it's quality when it's in fact the opposite. They would be better served admitting they just don't want to support it.
The leading case in point is Creative Assembly's Total War Franchise. They DO support mods, but certain key parts of the game they won't support mods like world maps and city/castle battle maps. Why? Because back in 2005 when Medieval TW 2 came out moders figure out how to mod everything. And they create huge overhauls like the lord of the Rings total conversion (Called Third age), and Darth Mod, and Stainless Steel, and dozens of others that to this day are 10x better games than anything creative assembly has done since. Including the Warhammer series. If you can squint your eyes a bit, and go DL those mods, you'll quickly get sucked in and realize those mods become some of the best most memorable games you've ever played, if you're into that kind of game.
Speaking from a unique standpoint myself, mods can also block certain creative avenues as devs can be liable for copying mods, much like lego can too (so they made lego ideas), and the leading irony here is most modders mod to make the game they wanted and get it right most of the time and would be more than happy if the dev integrated them... Just like how Creative Assembly hired one of the leading moders for the TW series... and yet, NONE of his mod vision has made its way into a commercial release of any TW series since.
But again, like the "size of dinos" issue, I don't like how this is being communicated. I get Frontier will support this for a long time, but I wish they would stop assuming gamers are not that sharp and just state, they don't want to support mods... But mods will still come eventually, they always do if the moders like the game enough.