Should also say that Finnish teachers have MAs, and the profession is respected, the jobs sought after.
Government after government has been happy to preside over low-quality entrants to teaching. Please spare me the wonderful-with-children-but-can't -spell arguments; I believe you can have it all; brains and attitude, and it should be demanded as requisite for the job, which might then have some claim to be a profession.
The job has always been seen as last resort. Friends of mine wondered aloud at when I'd go for something better/more suited to my intelligence.
When at school in the early-70s, teacher training was seen as the option for those who couldn't get in to uni.
The "mums' army/real army" solutions to staffing issues by various governments have added to the general air of "anyone can do it", which is most unhelpful.
Here's a comparison; think about the people you were at school with who ended up doing medicine; were they really ultra-bright? Brighter than you? No. Undoubtedly intellectually capable. They had to work their arses off to get into a closed shop, and still do. In Australia, the competition for medical courses is so fierce, students have to be in the highest percentile in empathy tests, as well as academic exams, so they think brains and attitude matter, too.
Raise the entry qualifications, and the money for teachers, and see the difference. But because most politicians educate their children privately, they're not interested in this.
I should say that the majority of teachers I've worked with have been very intelligent, with excellent subject knowledge, but I've met far too many dim bulbs.