Pocket vs WhatsApp

This means that Pocket is (currently) a total lock-in.
This is very sad, unfortunate and creates a no go decision for any seasoned user.
Too many bookmarking and tagging companies have stopped or have gone bankrupt these last years (e.g. Kippt, Spingpad, Delicious (to some extent), etc...). So, if you are going to invest a lot of your personal time and energy in curating your Internet findings (i.e. your bookmarks and tags), it is essential that a total, fair and open export (including all tags) functionality is provided. Personally tested the export "feature" and the resulting .html file that Pocket generates currently included only the URLs themselves, i.e. no save dates nor any of your personally curated tags, nor any other useful meta-data.
This is deplorable, because otherwise, Pocket is a very polished and well-functioning piece of multi-platform and multi-device software/app/web service, with a very easy and well-designed and implemented user interface...
Please fix this, Pocket !
These days of open and inter-operable web services, users are only attracted by valuable functionality, clean UX design and no lockins.

Although the pro version lets us search by tags, the search results unfortunately does not follow the time sequence of the saving of articles. Search results may show some old articles first, then a bunch of new articles, and then again old articles. It's so random and frustating.

I have been using Pocket pro for quite a long time primarily because it lets me have the permanent copy of a news (this feature is really useful in journalism). However, when I search tag wise for the old references, the absence of time-sequencing the search results really frustates me.

If the page title isn't correct/good for a link, there is no way for you to fix it.

A real bookmark tool has editable fields like title, url, folder, tags, notes. This saves webpages.

For example, imagine you accidentally created a tag "US" instead of "USA," and saved some articles under "US." The unfortunate part is even if you edit the tag and rename it "USA" , the previous tag name will always appear in the suggested tags: so when saving an article, if you type US in the tag box, you will see two suggestions "US" and "USA."

When importing bookmarks from Firefox, Pocket doesn't include the tags.

WhatsApp shares your messaging meta data with Facebook if you do not opt-out in the settings. If you use the same phone number for WhatsApp and Facebook, the profiles can easily be linked.
See https://www.whatsapp.com/faq/en/general/26000016

WhatsApp cannot be used by people without a smart phone with an active cell plan. If your phone is lost or damaged, or if your phone number changes, you cannot get messages sent by friends without them updating your phone number. You cannot send message to them until you are able to get SMS messages at your phone number.

Not open source.

Migrating your chat history from Android to iOS or the other way around is not so simple. In some cases it requires a 3rd party app and in some the only way is to migrate specific chats one by one.

To use your computer to send messages your phone must be on with a consistent data connection.

You cannot use the same WhatsApp account on multiple devices (e.g. a tablet, a PC and a cellphone). The account is tied to the device with the specific cellphone number. Chat history is deleted when you sign in to a new account, unless you have created a backup.

Messages are not stored on WhatsApp server for privacy and security reasons.

WhatsApp now allows users to share files of any type, but there is still a 16 MB size limit.