The insult to ladder players does not have much arguments to back it up as the staggering majority of custom maps doesn't come close to the Starcraft 2 Melee gameplay.
Aside from that there are some easy yet sad answers to your questions:
1) Popularity system, along with missing lobby browser, no chat channels, etc. Killed a lot of the scene off in WoL already. Nowadays it got a lot better but there is just so many bad maps you have to go through until you find a good one.
2) People simply have to upload it to two servers they could do it themselves I don't really see the problem here. It is just a bit inconvenient for the author.
3) There were and are some good custom games still floating around but those that get taken over often get developed into oblivion and people lose interest. I don't think people hold their projects back deliberately. You also have a limited filesize which further gets broken down into separate uploads so using a lot of custom assets forces you to create a lot of small dependencies (for example) or circumvent the limit by having friends help you out with their filesize.
4) Map making is very time intensive and the editor while powerful is quite unwieldy. People often start out with a rough idea and then get lost in the editor or churn out a very early version and then stop.
5) Many map makers are rookies nowadays so they lack experience with the editor AND often lack experience in designing a good game.
6) We have a lot of custom assets now but the original game and scene at the start did not have as many and as diverse Warcraft 3 had to offer in the base game and we are a long shot from the Warcraft 3 custom scene at this point in time. Also see point 1 for early community disinterest.
Lastly the Starcraft 2 mapping community is now mostly active on Discord.
1.87919064539801
The insult to ladder players does not have much arguments to back it up as the staggering majority of custom maps doesn't come close to the Starcraft 2 Melee gameplay.
Aside from that there are some easy yet sad answers to your questions:
1) Popularity system, along with missing lobby browser, no chat channels, etc. Killed a lot of the scene off in WoL already. Nowadays it got a lot better but there is just so many bad maps you have to go through until you find a good one.
2) People simply have to upload it to two servers they could do it themselves I don't really see the problem here. It is just a bit inconvenient for the author.
3) There were and are some good custom games still floating around but those that get taken over often get developed into oblivion and people lose interest. I don't think people hold their projects back deliberately. You also have a limited filesize which further gets broken down into separate uploads so using a lot of custom assets forces you to create a lot of small dependencies (for example) or circumvent the limit by having friends help you out with their filesize.
4) Map making is very time intensive and the editor while powerful is quite unwieldy. People often start out with a rough idea and then get lost in the editor or churn out a very early version and then stop.
5) Many map makers are rookies nowadays so they lack experience with the editor AND often lack experience in designing a good game.
6) We have a lot of custom assets now but the original game and scene at the start did not have as many and as diverse Warcraft 3 had to offer in the base game and we are a long shot from the Warcraft 3 custom scene at this point in time. Also see point 1 for early community disinterest.
Lastly the Starcraft 2 mapping community is now mostly active on Discord.