Microtransaction DLCs should not effect the workshop.
With the Thrillseeker edition we got a Gold Avatar Crown and a Gold Entertainer. The great thing about the Thrillseeker add-on was that it did not effect the workshop. If I place a Gold Entertainer in my park and share the park on the workshop, other players who do not have thrillseeker would still be able to download the park and the entertainer would switch back to being non-gold.
When Frontier first announced DLC they called it "cosmetic" which made a lot of people wonder what that meant. Some of us thought it would be Avatar Clothing, or new colors for Entertainer clothing. Things that would not effect the workshop.
I do love this game, and I do think Frontier is one of the most engaging developers I have ever seen (by far). But when I played RCT3 it was not fun trying to download a park that contained various CSO (Custom Scenery Objects), and this new style of Microtransaction DLC has me nervous about the workshop turning into a messy catalogue of "You need DLC to access this" and "Which DLC am I missing?"
The only thing I was ever forced to purchase in my life was car insurance, because it is the law. I have never felt like anything I purchased was not optional. Of course purchasing a video game is totally optional
But in this case, you are not being very fair. If I want full access to the game, and full access to the workshop blueprints that people create, than this DLC is absolutely mandatory (still optional) but a very big requirement for full access to the game.
Its like saying "you bought the base game, but now you have to pay more for the special access" which would be fine, if the quality was better. In RCT3 if I bought the base game I got everything that was included with the base game, and if I wanted to buy the expansions there were only 2 I had to worry about. How many DLCs will Planet Coaster have? I don't mind the fact that I have to pay for add-ons, I just dont want 100 microtransaction small DLC packs that only contain a few good items.
Its not fair how you put one good object in each pack (a transparent window) when that is something many people have been requesting in the base game

but no entertainers, no shops or wall pieces, no sound clips, like really? How you not give us a complete scenery pack? I would be willing to pay more if the DLC packs were complete, but I wont support microtransactions