The reason why Sweden has similar regulations comes down to relative simple reasons. The state want homeowners to have home insurance in case something bad happen that would result in the state/city having to step in and pay for it, such as a fire.
Insurance companies want lower risks (and might also be pressured by the state to have lower rates). They want everything that is covered by the home insurance to be installed by a licensed contractor, and in the case the contractor is at fault, they want them to have insurance against mistakes.
And thus the government create licensed tradespeople to facilitate the above. Unhooking a toilet is not hard, but home insurance covers water damage.
Sweden also has a lot of social safety nets so in the case that someones home get destroyed the city is required to help them. Requirements for home insurance moves some of that risk onto insurance companies.
You don't necessarily need licensing for liability issues, just a requirement for contractors to carry public indemnity insurance and only work within its terms.
It is not necessary but the situation that the government sits at is tricky. Intervention like sending out fire trucks or giving health care is usually paid upfront by the government, as is social support aid in the case the homeowner become homeless. If neither the contractor nor the homeowner can pay it will be up to the government to foot the bill.
In theory, if insurance companies would give out public indemnity insurance to unlicensed contractors then it would lower the risk for the government, assuming the coverage is broad enough. It also assumes that the cost of getting such public indemnity insurance is lower than getting a license, or contractors would just get the license instead.
I would hazard a guess that the reason for the two licenses is different. For some reason braiding is classified under cosmetology, and cosmetology industry used to involve a lot of hazardous chemicals. In order to address health issue among employees who died an early death thanks to dibutyl phthalate, formaldehyde, lye, ammonia, and coal tar, the government stepped in a started to regulate the industry. It similar to how mining and particular coal mining has a lot of regulations.
Of course, one can braid hair without the employees being exposed to toxic chemicals. Still, cosmetology is even today regarded as one of the more dangerous jobs in terms of toxic exposure, and many employees do get exposed to nail polish, hair dyes, and nail polish removers.
There is also a cultural aspect to it. The demographic that work as beauty salons tend to be young women. Politician that drive harsher regulation in this area want to gain votes by being perceived as the champion and protector of women.
The reason why Sweden has similar regulations comes down to relative simple reasons. The state want homeowners to have home insurance in case something bad happen that would result in the state/city having to step in and pay for it, such as a fire.
Insurance companies want lower risks (and might also be pressured by the state to have lower rates). They want everything that is covered by the home insurance to be installed by a licensed contractor, and in the case the contractor is at fault, they want them to have insurance against mistakes.
And thus the government create licensed tradespeople to facilitate the above. Unhooking a toilet is not hard, but home insurance covers water damage.
Sweden also has a lot of social safety nets so in the case that someones home get destroyed the city is required to help them. Requirements for home insurance moves some of that risk onto insurance companies.