1) The limit on 900px width seems unnecessary. Having to down sample every photo means that useful detail in the photos are lost and it's also a pain for the user. The ideal would be able to upload any size (say up to 5000px on any edge) and then have the forum software make a smaller version for display in line with text with the ability to see the larger one upon clicking.
2) The limit on the number of photos to 5 means that you have to make multiple posts to document something. This inhibits users from making detailed long-form posts and creates unnecessary scrolling if they have to spread it out over several posts.
3) The lack of ability to show the text and photos in an alternating fashion makes it difficult to caption photos and clearly convey an idea.
The only other option I can see to get around this is to use a third party image hosting service. This is great for doing all of the above however it's not a good long term option. Open and thread older than a few years and you'll see that half of the linked images no longer show up.
2) The limit on the number of photos to 5 means that you have to make multiple posts to document something. This inhibits users from making detailed long-form posts and creates unnecessary scrolling if they have to spread it out over several posts.
3) The lack of ability to show the text and photos in an alternating fashion makes it difficult to caption photos and clearly convey an idea.
The only other option I can see to get around this is to use a third party image hosting service. This is great for doing all of the above however it's not a good long term option. Open and thread older than a few years and you'll see that half of the linked images no longer show up.