Bing Penalty ↔ take Bing Report errors & even warnings VERY seriously - even short/long titles & descriptions - bing will outright refuse to Crawl your site due to "low quality". It doesn't matter if Google indexes your site well - Bing has very different, very strict rules for "quality" (purely based on meta tags/markup) & will outright refuse to index any page that fails it's rules (below).
aka Bing-Quality-Criteria
having more than one h1 tag is ☠ to Bing search!
bing rules for page titles
title.length \>= 15 && title.length <=70 || "Bing Will Ignore Your Page for Indexing!"
bing rules for page descriptions
description.length \>= 25 && description.length <=160 || "Bing Will Ignore Your Page for Indexing!"
Bing's title and description length were (probably) determined from arbitrary limits inferred from google SERP which truncatse titles to 70 chars & description to ~160 chars. Some SEO research papers suggest these numbers too. Apparently, Google has stated that they do not factor in any arbitrary title/description limits to their search algo - which is also why Google continues to ranks long titled/descriptive pages just fine.
Sadly, 🦆🦆🚶♂️ relies on Bing for indexing, so that's enough reason (for me) to care enough to fix bing's SEO quality params
Bing Search Performance page displays stats with a 2-day lag
Bing SEO Reports is auto-generated every 2 weeks & can not be triggered manually - unclear if negative (outdated) flags impact crawl rate until refresh
References
Bing URL Submission↔ to dispatch URLs for Bing to "immediately" evaluate for Bing Quality Criteria & (allegedly) get content indexed faster. Annoyingly, prevents any subdomain URLs?!