I Really think the arks needed to bring more people...here's why...
In an effort to fill all the empty space with things to do they clearly did not study Witcher 3 or Bethesda, but instead copy/pasted from DAI. Endless repetitive respawning of enemies.
Endless spawning of Remnant? Plausible. Endless spawning of Kett? A stretch, but still plausible given what we know about them. Endless spawning of Andromeda species? How many people did we bring on the arks again? Pretty sure I have killed half of them leveling past 50.
I understand Bioware may feel the need to push their new combat system to the forefront. But endless and frequent enemy spawning is not filling your empty maps with interesting things. It is a lazy point and click dropping of Ikea fabricated encounter points often placed too close together. You are an explorer this time around, not a Specter. Your role is different and what you are exploring for is not the next fight, but what is beyond the next hill.
You had 5 years Bioware and you got lazy.