Moving power to other organizations *is* a policy, and one which different people will have different opinions on. There are many reasons why it may be desirable for Parliament to transfer some powers to different bodies (some regulations require technical knowledge that MPs don't have, some issues are either local or supranational in nature, etc. etc.) You have singled out a particular type of transfer of powers (to supranational institutions), made it clear that you disagree in principle with those kinds of transfers, and then stated that you believe MPs should have a salary reduction for doing so. You have singled out another transfer of powers away from Parliament (to local authorities), indicated that in general you support that kind of transfer of powers, and stated that you don't believe MPs should receive a salary reduction for doing that (even if it has exactly the same degree of impact on how much work MPs have). That is clearly (1) arguing for MPs to be given a financial incentive against certain policies (ie. policies related to distribution of various legal powers) that you disagree with, and (2) very obviously likely to introduce a massive conflict of interest when MPs are deciding on policies related to distribution of powers.
The crucial difference is, where Government delegates a power to a Local Authority, it is still for Government to monitor, review and if necessary repeal that decision if necessary. The responsibility for how that power still rests with central Government.
Compare this to VAT law in which EU member states are required to charge a minimum rate of VAT on goods. Central Government has no power to review or repeal this power even on such a trifling aspect of policy. The only way this situation would change would be through a large constitutional upheaval. Such situations represent a real diminution in the role of parliament, and as a consequence, the role of MP's.
I can only assume from that comment that you are unaware of just what responsibilities MPs do actually have. Their job is most definitely *not* confined to or even primarily about making laws. (And since most MPs do not in any case have the legal skills required to write laws, that's arguably a very good thing).
The primary role of parliament is making laws, hence why it is called a legislature, and while MP's do have other roles including committees, sorting out knotty problems for their constituents etc, their primary role in the constitution is reviewing and deciding legislation. That is what they are elected to do.
True they would probably need a legal bod to articulate the laws, and of course, much policy starts in the Executive (itself made up of members of parliament), but it is for Members to decide what policies make it into law.