Hey @Leon Davis - like other SaaS cloud products, Trello is constantly being improved and added to.
If you're looking to bulk delete things in Trello, I recommend using the Bulk Actions power-up: https://trello.com/power-ups/5e4464985fd190825d164de3
Sorry, but do not agree, Trello is in basic not very developed the last few years lossing on Asanana or Monday. In basic Trello is very basic and you need power ups to add some additional functions whereby some of the power ups are of poor quality. Simple things like sub taks and the fact that costum fields are showing on all cards on the board are not yet tackle. Yes, Trello is good to start with but the more you get experienced in Trello the bigger you see the limitations. It’s a good start although for every one who wants to start with some project management tool.
+1 @Nic Brough _Adaptavist_ - Asana and Monday are our competitors, but also compete with Jira.
I wouldn't say Trello is a basic product, but as you go up the tiers, obviously you get access to more features. Power-Ups are like Jira/Confluence extensions, there's ones developed by us (Read Me, Package Tracker, etc.) and some developed by third-parties. There are some really great ones out there.
In terms of Custom Fields showing up on all cards in a board, this adds to Trello's vision of everyone having the same view on a board and being able to do the same things.
Sub-tasks can be tackled with power-ups as well, and we also have the ability to link cards.