Oh contraire, matters for two reasons. First there are 2021's built Nov/Dec. 2020. Unless some major flaw happens with Refresh models, those should have lower resale/trade in values. Wait till KBB, Carmax and others track value for 2021's. They will lower the computer values published. Model year definitely affects values in later years.
Second reason, parts. Need seat, dash, trim or other part for your "2021 MX". When it's 2025 and you need a part, it won't be as easy. Two different platforms for 2021 model years.
I have waited almost a year so what's another month or two and the above become irrelevant.