To establish my bona fides, I have 12 Level 140 characters and 1 level 129 character. With the exception of Gundabad prospector, all crafting professions are at maximum. With one exception, all associated guilds are at maximum. In all cases, I collect every recipe available as I quest through each region. I cannot recall the last time I used any of these recipes. I collect them for giggles.
I am behind on regions but continue to close the gap.
Professions: Since my characters are already fully committed to the old system, having amassed an immense number of recipes, I cannot take advantage of any new mix and match system because it would result in an enormous loss of effort. I can take advantage of a fourth profession. It will require hundreds of hours of play time to add a fourth profession to each of my characters--collecting materials, crafting for experience, making and using guild reputation, and collecting recipes. I will need to carve this time away from missions and questing over a protracted period of time. This is not a complaint. I do not mind diverting the time, but I want to make clear it will happen.
Crafting Guilds: Adding farmer, forester, and prospector guilds will cost me over a hundred hours of play time redirected from missions and questing. Again, this is not a complaint, just an observation.
Crafting Relevance: In my opinion, you need to ask a basic question: Who is crafting for? If crafting is for group players, they want crafting to provide quick and easy items that make dungeons easier. They want to be running dungeons, not crafting. If crafting is for solo players, they want crafting to provide equipment (and perhaps products to sell). Solo characters are willing to pay a reasonable crafting time cost for that better equipment (and those products).
All players want better equipment because it reduces time burden on activities to make characters more powerful. When you put all equipment in dungeons, you effectively place a massive time tax on solo players because it now takes them much longer to accomplish anything that involves combat versus a group player. If you want all players to have roughly equal time burden, you will need to construct completely different equipment paths for group and solo players. When you developed Delvings, you built in a time cost making them roughly equivalent to mid tier group content. If you want to give solo players good equipment through crafting, you will need to build crafting around a similar time cost analysis.
No solo player wants a bunch of recipes that only work with stuff from dungeons because they will never get to execute those recipes. Group players would rather get drops from dungeons instead of fiddling with crafting. This is like introverts versus extroverts. They are completely different kinds of people with completely different personalities and needs. If you want to please both, you need to build activities aimed at both, and both types of person will dislike activities designed for the other type of person.
(A few group players also enjoy crafting and would like to leverage both systems but I submit a priori that such people are exceptions to a general rule.)
Crafting and Housing: I am intrigued but need more information to offer a useful opinion. Please remember that housing hooks are a very scarce commodity, so while new housing items are great, the vast majority never get used on a per player basis.
Events: What a wonderful idea. The person who thought that up must be very beautiful and wise and have a lovely singing voice. 
In Closing: You are walking a very difficult path, Mister Orion, and I sincerely wish you much luck. Be wary of over simplification to appease the disinterested. That path closes down may others.
Edit: I see a lot of posts in this thread by people who simultaneously want crafting to take a lot less time and yet offer much better items. You may need to explain to them that time to acquire an item needs to roughly match for different activities, otherwise, everyone is pulled in one direction and unhappiness results.
Last edited by SophieTheEnchantress; Mar 17 2023 at 03:17 AM.
Sophie the Enchantress - Creator, Dreamer, Explorer - Happy yet Sad - Seeker of Beauty and Wonder
I wish all of you many successful and happy adventures., brave Ladies and Lords of Middle Earth!