It is unlikely to be wise to omit meaningful asset accounts. If you have a joint savings account with your kid that has a few hundred bucks in it, feel free to omit the account. If you have an account that you're interacting with on a regular basis, however, you really want to include that account.
You mentioned paperwork and extra work as one of your concerns. Omitting asset accounts has the potential to create far more work for everyone. If an underwriter looking at your bank statements sees a regular transfer to another account and they don't have paperwork for that account, they should be going back to you to get that information. Underwriters have to be distrustful-- if accounts are missing, they have to suspect there may be a less than ideal reason for that. A borrower might "forget" to mention a brokerage account where they have a substantial margin loan or to mention a 401(k) where they had taken out a loan. If an underwriter has to come back and ask you for additional documentation, particularly if they have to do it several times, that's going to be far more work for everyone, you included. Plus, if you make the underwriter suspicious, they're going to review everything more closely which can only lead to more work. Of course, your particular underwriter might not notice the missing accounts. But I'd much rather spend an extra hour getting some statements together before I apply rather than adding multiple days to the underwriting process if they have to come back and ask for more information.
Unless you are an expert in mortgage program qualifications and you are certain that you're going to qualify for the best possible rate for your chosen program with plenty of room to spare, omitting assets could easily hurt you. There are lots of mortgage products and lots of guidelines and a very wide range between a loan being denied and a loan being offered at the best possible rate. No one is realistically going to tell you "Gosh, if only you had another $x in assets, I could get you a slightly better rate". If you show the assets, on the other hand, you potentially give your broker/ loan officer some additional options. There are more options these days to do things like treating assets as income if you need to improve a DTI ratio, for example, than there used to be. Now, is it particularly likely that showing additional assets is going to end up making a difference for your loan? Realistically, no. But even if we're just talking about a few percent probability, for most people buying a house, it's worth submitting a couple more statements.