Doing this means that:
1) there are now an infinite number of URLs for every one of your pages that may end up separately stored on various services (mitigated for only some kinds of service if you redirect to correct),
2) if the title changes the URLs distributed are now permanently wrong as they stored part of the content (and if you redirect to correct, can lead to temporary loops due to caches),
3) the URL is now extremely long and since most users don't know if a given website does this weird "part of the URL is meaningless" thing there are tons of ways of manually sharing the URL that are now extremely laborious,
4) have now made content that users think should somehow be "readable" but which doesn't even try to be canonical... so users who share the links will think "the person can read the URL, so I won't include more context" and the person receiving the links thinks "and the URL has the title, which I can trust more than what some random user adds".
The only website I have ever seen which I feel truly understands that people misuse and abuse title slugs and actively forces people to not use them is Hacker News (which truncates all URLs in a way I find glorious), which is why I am going to link to this question on Stack Exchange that will hopefully give you some better context "manually".
meta.stackexchange.com/questions/148454/why-do-stack-overflow-links-sometimes-not-work/
Many web browsers don't even show the URL anymore: the pretense that the URL should somehow be readable is increasingly difficult to defend. A URL should sometimes still be short and easy to type, but these title slug URLs don't have that property in spades.
If anything, other critical properties of a URL are that they are permanent and canonical, and neither of these properties tend to be satisfied well by websites that go with title slugs, and while including the ID in there mitigates the problem it leaves it in some confusing middle-land where part of the URL has this property and part of it doesn't.
If you are going to insist upon doing this, how about doing it using a # on the page, so at least everyone had a chance to know that it is extra, random data that can be dropped from the URL without penalty and might not come from the website and so shouldn't be trusted?
(edit to add:) BTW, if you didn't know you could do this, Twitter is most epic source of "part of the URL has no meaning" that I have ever run across as almost no one realizes it due to where it is placed in the URL.
twitter.com/realDonaldTrump/status/247076674074718208