No company can plan based on the tariffs. There is zero guarantee that then next government won't revoked them or that the current one won't flip-flop. Local manufacturing doesn't swing on a 2-4 (or 6 or 8) year timescale. There needs to be consistency.
The company that moves (or starts) manufacturing here today might get run out of business when/if tariffs are repealed and their competitor already has production lines in other countries ready to go. Heck, the factory might not even open before the winds shift.
No one can accurately plan with the uncertainty.
All the big names like Apple are just paying lip service to this. They are throwing, quite literally, pocket change or funds from the government (like CHIPS, which was less ham-fisted than the tariffs IMHO but still not something that's going to change the landscape overnight) at these endeavours to appease the current admin in favor of reduced/removed tariffs on _their_ products and good PR.
If congress wanted to actually do their jobs instead of both them and the judiciary abdicating their responsibility to the executive branch then _maybe_ we'd have a chance in hell. Until then you can look forward to more flip-flopping as the government changes and the smaller companies continuing to be ground under the heel of large corporations who can weather (or bribe) their way out of the tariffs.