Adding weight to a drone intended to fly only 250 grams could easily be negatively influenced by the additional weight ...the center of gravity could be shifted for example, effecting its aerodynamics
Like anything, common sense needs to be applied. I typically fly my
Mini 2 with leg extensions, a lens hood and then 3 or 4 strobes, depending on if I need top and bottom strobes which comes in at 285-293 grams. I find these accessory items essential. One of the big upgrades of the
Mini 2 over the
Mini 1 was more powerful motors. And yet the
Mini 1 flew just fine with the same accessory configurations. You are correct in as much as weight distribution is important, and the better the even distribution it would seem that the better the performance. The IMU in these things is a wonder as it has the capability of correcting minor discrepancies in weight distribution. Obviously it has its limitations, but I haven't found any issues in the
Mini 1 or two, even when a lot of the additional strobe light weight is toward the front.
I believe the assertion that the drone was intended to fly only 250 grams isn't accurate. The 250 gram limitation was to accommodate the restrictions of many governmental entities. Of course the power had to be adequate, but the design not only factored in payload, but wind resistance as well. The
Mini 1 that I had flew quite well with a modest amount of accessories flew very well, without any issues whatsoever remained pretty much the same in the
Mini 2, which got a significant boost while lightening the overall drone by a few grams. This proves the converse to be true that not only is the
Mini 2 designed to power a sub 250 gram drone, but perhaps much more.