In case you consider whether to burn subtitles in video permanently of just bind video file with subtitle file, keep take a look on following article, describing pros and cons. List is not full, but covers main aspects.

Advantages of burning subtitles directly into video

You don't care about whether your player can bind subtitles to video or not.

You can view a video on every player without solving a problem with an additional files with subtitles.

You can use almost every video player with proper codec

Different video players work with different subtitles format files. Just image, that before you watch the video, you have to check, if subtitles file format is suitable for you (.vtt, .srt, .ttml etc). In case format of your subtitle file is inappropriate, you can surely convert it, but it will take time. In case subtitles are burnt in video, you don't have this kind of problem.

Greater video accessibility for users

People often don't know how to use subtitle files. Imagin your grandparents, who are going to watch a video in a different language and even if case they have subtitles, they just don't know, how to switch it on (bind to video).

Disadvantages of burning subtitles direcly into video

Quality loss of video

Burning subtitles permanently into video file means re-encoding video and nobody guarantees you have good enough equipment to do it without loosing quality of an original video. In the end it means that won't have proper codecs to make final video of the same quality as original one has.

No way to use subtitles in another language

In case subtitles are burnt into video, it disalows you or other users to use other subtitles. No, in theory you can show another subtitles, with they will interfere with burnt ones and the only solution is to re-encode vide and blur them or just skip with a flat rectanble of another color and after that you will see subtitles you bind. It will surely reduce the visible part of video.

Troubles in sharing your video

There are cases, when value has not video itself (can be taken from several sources), but it subtitles. Then the only way to share translated video is to use internet server (file storage) or external file drive (HDD, USB, etc). It will take time and moreover you need good upload speed (and download-speed for end users). Sharing only one small subtitles file would be more fast and effective.