This. In my last game, 80 worlds, 18 had AI Eyes on them. That's a pretty common ratio - somewhere around 1/4 of worlds seem to have them. That's one heck of a lot of speedbumps. And as Wanderer said, a Mk IV world with a Spire Shield post and Stealth Guardposts? That's no longer a speedbump, that's a flat-out roadblock.
Really, as a nerf, I'd just be happy if the number of Eyes was reduced.
I don't see a problem with AI eye's and spire shields, provided both have sensible spawn rates, and that both seeding processes are independent (aka, the presence of a spire shield guard post neither boosts nor diminishes the chance of an AI eye spawning on that planet as well, and vice versa). We can stack ludicrous defensive solutions on one planet, so why can't the AI.
On the numbers thing, what AI types were you playing against? Some AI types get a bonus to the number of eyes they get. If both AIs were high difficulty turtles (turtles having the highest boost in AI spawn rate), I could see the expected AI eye rate hitting 1/4.
Do you have a save game and/or game setup to produce such a map?
Here's two games - I restarted two games from my archives, used the cheat to reveal everything, then counted the AI Eyes.
Game 1 - 8/8, Camouflager, Neinzul Youngster. 100 stars, 15 AI Eyes.
Game 2 - 8/8, Peacemaker, Everything. 100 stars, 30 AI Eyes.
From the Wiki, it looks like Camouflager is a defenseive type, while Neinzul Youngster is offensive. The Peacemaker and Everything should be neutral.
Either way, 15% of the galaxy was full of speedbumps in one game, and
30% of the galaxy in the other game.
Examples of some of those 30 systems? Try:
4 systems with Counter III and Spire Shield III,
1 system with Counter IV and Spire Shield IV,
4 systems with either a Counter (III, IV) or a Spire Shield (III, IV),
A Core world with a 2! Spire Shield Vs,
A Homeworld with Core Spire Shield and Core Neinzul Spawner.
That's a LOT of grind - and while the Homeworld shouldn't count (it IS a Homeworld, after all), I included it to show how difficult it can be to handle the AI Eye sometimes.
And no, I never finished either of those games - looking at game #2, I'm glad I didn't.