I wouldn't recommend it. I personally benefited a lot from helpers especially on projects that needed to get done really quickly. A quick glance to CI3's doc and I could easily get things like plural(), humanize(), unix_to_human(), nice_date(), form_open_multipart() without creating my own or moving to different frameworks (like Moment.js for date formats) all the time just to get the same output. Creating <select><option> inside a PHP loop really looks ugly. It even gets uglier if your team can't even decide whether to use curly braces VS colon-endifs as a convention for loops in a view file, which leads to more denied Git pull requests. A simple <?= form_dropdown(...) ?> and everything is accepted beautifully.
CI4 is going to get a massive blow from other frameworks that have tons of helpers in their arsenal. I'd advise re-evaluating the functions/methods instead of removing the helpers themselves.
Long live CodeIgniter!
