Shmendrick reminds me of people who use mesora to fight any change but have no clue what mesora is. Frumkeit has ossified only in the last ten 250 years as a reaction to Reform and secularism. The davening, for example was constantly being added to. Just look at the piyuttim from yomim norayim. Most were composed between 800 and 1300. Kol Nidre was added in the middle ages, as was Nesane Tokef. Kabalas Shabbos is only about 500 years old.
A typical response is that we are not of their madriga, but then neither were the people who made the changes compared to generations that preceded them