Tesla for a long time had a lack of serious competition, and a popular hype man at the helm that kept investor's eyes pointed at the future, by making promises such as "Fully self driving in 12-18 months" for a decade plus.
With the age of pop culture hype taking a turn for Musk and Tesla, competition starting to look quite attractive, and the whole sector becoming more mature, attention is beginning to flow back to boring things like build quality.