This is also a very minor suggestion for making the limit much higher.
Why does it need a limit? They're only tags for mews sake.
I only found out when asking a question earlier.
Because adding too many tags makes them kind of useless. They are meant to categorise the question so people can find the things they know/care about.
If you think you need that many tags then it's likely your question is about too many things (and should be 2 separate questions) or you're trying to add a tag that doesn't really describe the question (eg a question about egg moves may be tagged 'egg-moves' but doesn't need a tag 'eggs' as it's not about eggs themselves).