My point is that the goalposts are often getting moved—even during the current season, when the popular CelticsStrong wisdom has gone from "You have to give them at least 20 games" to "You have to give them at least 30 games" to "You have to give them at least half the season," and now it's shifted to "You have to give them at least till the all-star game."
I’m curious, what is it about how the team is playing that has you particularly worried ?
They stunk early. Since their 10-10 start, though, they’ve gone 19-10. That’s a good stretch of basketball. Is there a major problem that needs solving?
They're 30-19 now, so they've actually gone 20-9 since the bad start, which is even better than what you said, but some of those losses were bad—Detroit, Phoenix, Miami, Orlando, even Brooklyn, which has been hot lately but still doesn't have anywhere near the talent Boston has. Boston won 5 straight before the GS loss, including a big win over Toronto, but struggled a little too much (IMO) to beat Memphis, Atlanta, and Miami.
As for major problems that need solving, I don't think the bench is particularly strong—Brown's been mostly solid of late, but Hayward's offense is sorely lacking, Rozier's ups and downs are thoroughly documented, and as a unit the bench has had quite a bit of difficulty maintaining leads. The defense hasn't been consistently good, or able to lock down, as often as I'd like. And the team, as a whole, often slacks off against weaker competition, and struggles on the road.