it’s not my opinion, read the wikipedia article you yourself referenced.
Polycarp visited the Bishop of Rome ( the Anti-Christ to some, LOL! ) and basically agreed to disagree on what day to celebrate Easter.
you claim some people were still celebrating the OT feasts and keeping the Sabbath, fair enough, i am merely asking for proof. i know what the Catholic Council of Laoedecia said, can you provide names of anyone doing this and can they trace themselves to the Apostles?
no one i have ever asked this question to can provide any names, i thought you would be different. i guess not.
I don't deny that the traditional church abandoned the feast days of the Lord over time. This was predicted in scripture. And as you just read it became heretical to keep the feast days after the council of Laeodecia.
If you're really interested in sabbath keeping throughout history there are plenty of resources on the web. Google "sabbath keeping throughout history" or variants.
The fact that Jesus Christ and biblical Christians should be enough for anyone.