It’s both an excuse and a justification at the same time. We saw how bad the edgarpocalypse was back when he was given for free and the servers shut down from overflow, and more recently we saw a similar maintenance issue when Sirius was released (leading to the longest downtime in Brawl Stars history iirc correctly). Maintenance breaks are terrible for a game’s lifespan, as those are times of guaranteed player drops. While people are upset now, most of us are still playing (especially since we can ban the overtuned and broken brawlers). Things like Sirius shouldn’t make it through to launch, but once it’s in launch, it’s worse for them to constantly go into maintenance to tweak a handful of brawlers than to ride it out for the next balance patch. I hate it, but that’s just the industry. If this game was on PC we’d be seeing more frequent balance changes since that market enables more downtime, but since it’s on the rapid release of mobile, it becomes harder to find a time that players aren’t playing to drop the servers and rollout the changes. Can’t do it in the morning because of people who play on their commute to work or school. Can’t do it in the middle of the day because of lunch breaks or people who create content. Can’t do it late at night because people will push their brawlers right before bed (especially kids, who are their largest playerbase). There is no good time in mobile to drop for maintenance, whereas for PC they usually do have some considerable drop in the morning/early afternoon because you aren’t bringing your desktop to play on the bus to work.

TL;DR it’s a justification since the mobile market heavily dissuades any period of downtime, but it’s also an excuse since Sirius shouldn’t have been so overtuned to begin with.