Switch had a launch + 1st holiday that year..... those two are more important than 2 extra months at the start of the year.
Nintendo itself also said that, but like you wrote, Switch lineup until April wanst good while from this month is getting quite stronger and espacily in second half of year when we will have Smash Bros and most likly Pokemon.
what holiday? im talking about this time last year switch was at around 1.19m. this year switch is currently at around 1.05m. switch is behind this year even though it had 4 months this year compare to 2 months last year
Switch sold around 1.2m only in March last year that was launch month, two more months this year can really beat that, so nothing strange Switch is still not YoY up compared to last year, but it will be in few months.